facebook/hhvm — pull request #3090 by reeze (2014-07-02 10:12:04+00:00)
Title: Update HHVM_API_VERSION

Since 3.0 `Extension` class has been updated, so we need
to update HHVM_API_VERSION, or HHVM could load extensions
compiled against HHVM2.2 and crash.

Closes #3032