Revert "Adding HHVM"
Revert "Adding HHVM"

This reverts commit 99c91778aa634a43ecfb912120d2f7cf9b3cae02.

dbellettini/php-eventstore-client,dbellettini/php-eventstore-client,FriendsOfOuro/geteventstore-php-core,tahoelimited/php-eventstore-client,alesblaznik/php-eventstore-client,alesblaznik/php-eventstore-client,Akii/php-eventstore-client,dbellettini/php-eventstore-client,tahoelimited/php-eventstore-client,Akii/php-eventstore-client,FriendsOfOuro/geteventstore-php-core