Add build in PHP syntax check on files.

Before certain things could still pass unless they were explicitly
looked for, but PHP checks basic syntax to make sure the file is even
readable.
Fixed bug #248 : FunctionCommentSniff expects ampersand on param name
Fixed bug #248 in Squiz sniff as well
Merge branch 'feature/php_syntax' of https://github.com/blainesch/PHP_CodeSniffer
Changelog + a few changes to make sniff consistent with others
Removed refs from param comments
See if the syntax unit test will run
Should go before the phpunit run