Added service AdExchangeBuyer.php
Bumping version
Fixing bad model checking

Issues #120 and #115 both address the issue of invalid null checks. I added a test
and caught another, so this looks good.
Remove use of static::

Breaks 5.2. This fixes #124
Adding http upload code to MediaFileUpload

Addresses #74
Adding phpunit to composer
Updated GamesManagement.php
Updated Games.php
Fix style issues

Also fix typo on on MediaFileUpload.
Merge pull request #126 from ianbarber/master

Various minor fixes
Updated PlusDomains.php
Updated Storage.php