Readme updates for Package Control Support and .gitignore.

I have added this Zephir package to [Sublime Package Control](https://sublime.wbond.net) and this includes some updates regarding the Readme and a .gitignore file for convenience. 

I also made some [similar modifications to the Volt package](https://github.com/phalcon/volt-sublime-textmate/pull/1).

Thanks for your guys' work on Phalcon and Zephir.