Editor Config (.editorconfig) Code Guide Update

Code Guide updates using new `.editorconfig` code style guide reference.

 All 'text' based files `.html`, `.css`, `.js`, `.json`, `.less`, `.md`, `.gitignore`, `.jshintrc` & `.yml` for entire Bootstrap 3.0.0-wip repo opened and saved using new `.editorconfig` code style guide with Sublime Text 2

Reference: https://github.com/twitter/bootstrap/pull/7642 https://github.com/twitter/bootstrap/pull/6342