Fixes #263.

Closes #265.

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. :-)

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.

- GetOrgMembership updated to accept user parameter (BREAKING CHANGE)
- EditOrgMembership updated to accept user parameter (BREAKING CHANGE)
- Added new RemoveOrgMembership method

Ref #187

- Add new options struct to AddCollaborator (BREAKING CHANGE)
- Add Permissions field to User struct, which gets populated when
  calling ListCollaborators

AddTeamRepo's "permission" option and AddTeamMembership's "role" option
should both be passed as part of a JSON request body, not as URL query
parameters.

- AddTeamMembership and ListTeamMembers both take new Option structs to
  specify role.  (BREAKING CHANGE).
- Add Role to ListMembersOptions
- update Permission and Role docs

Ref #187

update CreateTeam and EditTeam to pass preview media type if
Team.Privacy is set.

Ref #187

- allow setting permission when adding a team repository
- update IsTeamRepo to return a *Repository instead of a bool, since the
  Repository contains the permission data for the team.  This is a
  BREAKING CHANGE, however I don't think this is an often used method.
- update docs for setting the team permission when creating or editing a
  team.

Ref #187

These changes are now official, so the custom media type is no longer
needed.  This does go ahead and remove RepositoryListOptions.IncludeOrg
which was being used to trigger the custom media type.  Even though this
is a breaking change, it was only in for a month and I don't think it
was too widely used during that time.

Fixes #219
/cc @captncraig who may have been using this

Change-Id: Ib54ced78c51a9c4e54e470136d36f91bf4716e8c

GitHub occasionally changes the IP addresses from which GitHub Pages
websites are served. For users of the service, they must upgrade any A
records to these IP addresses to continue using the service. This patch
provides this data in the `APIMeta` struct as the property `Pages` and
populates from the /meta endpoint.

Release Announcement:
https://developer.github.com/changes/2015-06-11-pages-a-records/

Fixes #212.

ocd kicking in :)

Supports the updated starring API as mentioned in issue #188.

There is now a new struct called StarredRepository which holds a Repository and the new `starred_at` timestamp.
For now there is a special media type to request the new API. I've added a TODO for it to be deleted when the new API fully launches.

There's no way of serializing/requesting an empty required_contexts that
is needed for bypassing the commit status checks for the ref.

It's a breaking change but will allow to serialize an empty array and
omit empty value as expected.

Fixes #185.