HHVM support for PHP 7

What this post added

This post announces and details HHVM's support for PHP 7.0.0, including new language features like anonymous classes and generator delegation. It outlines the strategy for simultaneous support of PHP 5 and PHP 7, detailing how compatibility issues are handled through INI options and default behaviors. The post also commits to keeping HHVM in parity with future PHP language developments and solicits feedback on nightly builds to ensure a stable 3.11.0 release.