Update ApiRequestor for newer hhvm

Current versions of HHVM don't include 'hiphop' in the PHP_VERSION string; they are using hhvm.  Update the SSL Cert check to ignore those versions as well, or your application will return an 'unable to connect to stripe' error.
Merge pull request #109 from brianmdavis/patch-1

Update ApiRequestor for newer hhvm
Fix phpcs style nit