Regen all docs. (#700)

* Stop recursing if discovery == {}

* Generate docs with 'make docs'.
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+
+<h1><a href="libraryagent_v1.html">Library Agent API</a> . <a href="libraryagent_v1.shelves.html">shelves</a> . <a href="libraryagent_v1.shelves.books.html">books</a></h1>
+<h2>Instance Methods</h2>
+<p class="toc_element">
+  <code><a href="#borrow">borrow(name, x__xgafv=None)</a></code></p>
+<p class="firstline">Borrow a book from the library. Returns the book if it is borrowed</p>
+<p class="toc_element">
+  <code><a href="#get">get(name, x__xgafv=None)</a></code></p>
+<p class="firstline">Gets a book. Returns NOT_FOUND if the book does not exist.</p>
+<p class="toc_element">
+  <code><a href="#list">list(parent, pageToken=None, x__xgafv=None, pageSize=None)</a></code></p>
+<p class="firstline">Lists books in a shelf. The order is unspecified but deterministic. Newly</p>
+<p class="toc_element">
+  <code><a href="#list_next">list_next(previous_request, previous_response)</a></code></p>
+<p class="firstline">Retrieves the next page of results.</p>
+<p class="toc_element">
+  <code><a href="#return_">return_(name, x__xgafv=None)</a></code></p>
+<p class="firstline">Return a book to the library. Returns the book if it is returned to the</p>
+<h3>Method Details</h3>
+<div class="method">
+    <code class="details" id="borrow">borrow(name, x__xgafv=None)</code>
+  <pre>Borrow a book from the library. Returns the book if it is borrowed
+successfully. Returns NOT_FOUND if the book does not exist in the library.
+Returns quota exceeded error if the amount of books borrowed exceeds
+allocation quota in any dimensions.
+
+Args:
+  name: string, The name of the book to borrow. (required)
+  x__xgafv: string, V1 error format.
+    Allowed values
+      1 - v1 error format
+      2 - v2 error format
+
+Returns:
+  An object of the form:
+
+    { # A single book in the library.
+    "read": True or False, # Value indicating whether the book has been read.
+    "title": "A String", # The title of the book.
+    "name": "A String", # The resource name of the book.
+        # Book names have the form `shelves/{shelf_id}/books/{book_id}`.
+        # The name is ignored when creating a book.
+    "author": "A String", # The name of the book author.
+  }</pre>
+</div>
+
+<div class="method">
+    <code class="details" id="get">get(name, x__xgafv=None)</code>
+  <pre>Gets a book. Returns NOT_FOUND if the book does not exist.
+
+Args:
+  name: string, The name of the book to retrieve. (required)
+  x__xgafv: string, V1 error format.
+    Allowed values
+      1 - v1 error format
+      2 - v2 error format
+
+Returns:
+  An object of the form:
+
+    { # A single book in the library.
+    "read": True or False, # Value indicating whether the book has been read.
+    "title": "A String", # The title of the book.
+    "name": "A String", # The resource name of the book.
+        # Book names have the form `shelves/{shelf_id}/books/{book_id}`.
+        # The name is ignored when creating a book.
+    "author": "A String", # The name of the book author.
+  }</pre>
+</div>
+
+<div class="method">
+    <code class="details" id="list">list(parent, pageToken=None, x__xgafv=None, pageSize=None)</code>
+  <pre>Lists books in a shelf. The order is unspecified but deterministic. Newly
+created books will not necessarily be added to the end of this list.
+Returns NOT_FOUND if the shelf does not exist.
+
+Args:
+  parent: string, The name of the shelf whose books we'd like to list. (required)
+  pageToken: string, A token identifying a page of results the server should return.
+Typically, this is the value of
+ListBooksResponse.next_page_token.
+returned from the previous call to `ListBooks` method.
+  x__xgafv: string, V1 error format.
+    Allowed values
+      1 - v1 error format
+      2 - v2 error format
+  pageSize: integer, Requested page size. Server may return fewer books than requested.
+If unspecified, server will pick an appropriate default.
+
+Returns:
+  An object of the form:
+
+    { # Response message for LibraryAgent.ListBooks.
+    "nextPageToken": "A String", # A token to retrieve next page of results.
+        # Pass this value in the
+        # ListBooksRequest.page_token
+        # field in the subsequent call to `ListBooks` method to retrieve the next
+        # page of results.
+    "books": [ # The list of books.
+      { # A single book in the library.
+        "read": True or False, # Value indicating whether the book has been read.
+        "title": "A String", # The title of the book.
+        "name": "A String", # The resource name of the book.
+            # Book names have the form `shelves/{shelf_id}/books/{book_id}`.
+            # The name is ignored when creating a book.
+        "author": "A String", # The name of the book author.
+      },
+    ],
+  }</pre>
+</div>
+
+<div class="method">
+    <code class="details" id="list_next">list_next(previous_request, previous_response)</code>
+  <pre>Retrieves the next page of results.
+
+Args:
+  previous_request: The request for the previous page. (required)
+  previous_response: The response from the request for the previous page. (required)
+
+Returns:
+  A request object that you can call 'execute()' on to request the next
+  page. Returns None if there are no more items in the collection.
+    </pre>
+</div>
+
+<div class="method">
+    <code class="details" id="return_">return_(name, x__xgafv=None)</code>
+  <pre>Return a book to the library. Returns the book if it is returned to the
+library successfully.
+Returns error if the book does not belong to the library
+or the users didn't borrow before.
+
+Args:
+  name: string, The name of the book to return. (required)
+  x__xgafv: string, V1 error format.
+    Allowed values
+      1 - v1 error format
+      2 - v2 error format
+
+Returns:
+  An object of the form:
+
+    { # A single book in the library.
+    "read": True or False, # Value indicating whether the book has been read.
+    "title": "A String", # The title of the book.
+    "name": "A String", # The resource name of the book.
+        # Book names have the form `shelves/{shelf_id}/books/{book_id}`.
+        # The name is ignored when creating a book.
+    "author": "A String", # The name of the book author.
+  }</pre>
+</div>
+
+</body></html>
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