Add support for project-local style (in .style.yapf)

YAPF will now look for this file at startup and use it as
the default if found.  If not found pep8 is still the default.

Now that we have project-local style there is no need for the
hardcoded yapf style (it will be the default for all files
in the yapf tree now).
diff --git a/README.rst b/README.rst
index 66517ce..8210cac 100644
--- a/README.rst
+++ b/README.rst
@@ -74,7 +74,9 @@
 
 Options::
 
-    usage: yapf [-h] [--style STYLE] [-d | -i] [-l START-END | -r] ...
+    usage: yapf [-h] [--version] [--style-help] [--style STYLE] [--verify]
+                     [-d | -i] [-l START-END | -r]
+                     [files [files ...]]
 
     Formatter for Python code.
 
@@ -83,9 +85,15 @@
 
     optional arguments:
       -h, --help            show this help message and exit
+      --version             show version number and exit
+      --style-help          show style settings and exit
       --style STYLE         specify formatting style: either a style name (for
                             example "pep8" or "google"), or the name of a file
-                            with style settings. pep8 is the default.
+                            with style settings. The default is pep8 unless a
+                            .style.yapf file located in one of the parent
+                            directories of the source file (or current directory
+                            for stdin)
+      --verify              try to verify refomatted code for syntax errors
       -d, --diff            print the diff for the fixed source
       -i, --in-place        make changes to files in place
       -l START-END, --lines START-END