Add .editorconfig file to source repository to maintain a consistent coding style

Hi all,

EditorConfig <http://editorconfig.org> is a project that helps developers define and maintain consistent coding styles between different editors and IDEs. The EditorConfig project consists of a file format for defining coding styles and a collection of text editor plugins that enable editors to read the file format and adhere to defined styles. EditorConfig files are easily readable and they work nicely with version control systems.

EditorConfig has been used in many large and famous projects, such as Ruby, jQuery, etc. I think the Git community may also find it useful, since there are some inconsistent indentation in the source code. 

What do you think about this?

Best,
Hong