Big Refactor

Added

• Added support for special function calls: main, include, require, Closure, Labmda, eval()
• Added support for PHP 5.1
• Keep collecting and sending back trace information after PHP bailout
• Added duplexing to communication module
• Compatible with Trait Alias
• Added checking for ZTS (Thread-safety support) during configuration

Changed

• Refactor the PHP extension
• Unified the naming convention of Type, Function, Macro
• Change License to Apache 2.0
• Change Extension's name to "trace" (php is redundant for a PHP extension)
• Improve representation of zval and support for Array, Object
• Improve performance when trace if off
• Limit the length of print arguments and retvalue

Fixed

• Fixed handling of large or small double value that needs scientific notation
• Fixed memory leaks related with SDS