This describes the package in a way that can be seen via godoc,
and makes it so that the following command succeeds without
"no buildable Go source files" error:

	go build github.com/google/go-github/...

Fixes #119
Fixes #325
Ref #241

fixes #274

This adds support and integration tests for editing branch protection.

This tool help to identify fields being returned by the GitHub API that
are not currently being mapped onto our Go data types.  Some of these
may be deliberate omissions, so these checks should only be treated as
an aid in identifying these fields, not as an absolute list of fields to
be added.