Fixes #263.

Closes #265.

As with the previous key added in 19c0916, I deleted the associated
private key using /usr/bin/shred.  But of course, I have no way to prove
that.  Again, all the more reason to always use a test account when
running these integration tests.

see 92bbb1ce51

This adds support and integration tests for editing branch protection.

For more information about the preview see here:
https://developer.github.com/changes/2015-11-11-protected-branches-api/

This adds only retrieving the information and not setting it. Setting
will come in a later commit (if that one here is okay).

I tried to follow the naming guidelines as much as possible and
hopefully I made it right the first time. :-)

Adding the new BasicAuthTransport raises the minimum required version of
go to 1.4.

Add a new error type, TwoFactorAuthError, which identifies the need to
include a one-time password when using Basic Auth for a user with
two-factor auth enabled.

An example of using both the new transport and error type can be seen in
examples/basicauth/main.go.

fixes #258

Both:
https://developer.github.com/v3/issues/#list-issues
https://developer.github.com/v3/issues/#list-issues-for-a-repository

State that the default is `desc` for direction. (As does my results). So
update the comment.

In particular, this handles the case of trying to decode No Content
(204) responses.

Previously, concurrent calls to Client.Do would have data races writing
Client.Rate. Protect it with a mutex.

Resolves #253.

The value "all" is also possible for State. See https://developer.github.com/v3/issues/#list-issues
and https://developer.github.com/v3/issues/#list-issues-for-a-repository.

Documented at https://developer.github.com/v3/issues/events/#events-1
and https://developer.github.com/v3/issues/events/#attributes.

> Event "renamed":
> 	The issue title was changed.

> Attribute "rename":
> 	An object containing rename details including ‘from’ and ‘to’
> 	attributes. Only provided for ‘renamed’ events.

Fixes #244

The RateLimit() func is deprecated, and should not appear in the
official example.

As of [fccbb9520b (diff-e754c06a3071f63f53cee61571452b4c),) `Users.List` method was updated to `Users.ListAll`. This commit updates the documentation for `UserListOptions` to reflect that change.

API URLs starting with "/" does not play well with Github Enterprise,
whose API endpoint looks like "http(s)://hostname/api/v3/".

This fixes incorrect URLs in miletones APIs.

This change adds the fields "DiffHunk", "OriginalPosition", and "OriginalCommitId" to the PullRequestComment struct. These fields provide important information about the location of a comment.