Changing check is Closure
Fixed tests for hhvm (function ngettext not supported  http://docs.hhvm.com/manual/en/function.ngettext.php )
Fixed Exception extends logic for hhvm ( https://github.com/facebook/hhvm/blob/HHVM-3.4.0/hphp/system/php/lang/Exception.php#L55 )
Not send code coverage to ScrutinizerCI for HHVM builds https://github.com/scrutinizer-ci/ocular/issues/10
Workaround for HHVM ( https://github.com/facebook/hhvm/issues/1447 )
Merge pull request #307 from naxel/master

Fixes for HHVM #299