Efficient TOML parser for 0.4 specification

Better strategic use of regular expressions, has resulted in speed improvements. Has the interfaces and design of the Zephir compiled version.

Improved performance

It is still a PHP interpreted TOML parser, with help from regular expressions. Now I have to see how well the same improvements will speed up the toml-zephir version, since this version now exceeds the performance of the last zephir iteration.