Regen all docs. (#700)

* Stop recursing if discovery == {}

* Generate docs with 'make docs'.
diff --git a/docs/epy/api-objects.txt b/docs/epy/api-objects.txt
index 6f2d29e..4425d64 100644
--- a/docs/epy/api-objects.txt
+++ b/docs/epy/api-objects.txt
@@ -86,6 +86,7 @@
 googleapiclient.discovery_cache.file_cache.FILENAME	googleapiclient.discovery_cache.file_cache-module.html#FILENAME
 googleapiclient.errors	googleapiclient.errors-module.html
 googleapiclient.http	googleapiclient.http-module.html
+googleapiclient.http.MAX_BATCH_LIMIT	googleapiclient.http-module.html#MAX_BATCH_LIMIT
 googleapiclient.http._TOO_MANY_REQUESTS	googleapiclient.http-module.html#_TOO_MANY_REQUESTS
 googleapiclient.http.set_user_agent	googleapiclient.http-module.html#set_user_agent
 googleapiclient.http.tunnel_patch	googleapiclient.http-module.html#tunnel_patch