Added X-header field to support file uploads for the PHP proxy
Merge pull request #1524 from benjamij/php-community-service-support-2

PHP file upload support for the CommunityService
Merge branch 'activity-unity-tests' of github.com:CarlosManias/SocialSDK into activity-unity-tests
Changed destination UUID parameter name to reflect changes made to the Unify enhancement
Added a couple more test cases