Added version and async to facebook sdk snippet, solves #12 and solves#13
Merge pull request #14 from fntlnz/develop

Facebook SDK Snippet Improvements
Code style
Set enabled
PHPUnit xml configuration
Changed enabled/disabled behavior
Render now uses new snippets behavior
Added PHP 5.6 and hhvm to Travis
Merge pull request #16 from ripaclub/develop

Fixed snippet enabling behavior