Add EditorConfig file

Added an [EditorConfig](http://EditorConfig.org) file. Also removed the TextMate one. Anyone using TextMate can install the [TextMate plugin](https://github.com/Mr0grog/editorconfig-textmate#readme).

I've just done a global "all files should be 2-spaced without trailing whitespace" configuration. Open to discussion on this if anyone really cares :P