Big Enhancements for Coffeescript. Fixed Bugs with js

# Javascript

Some js snippets could not be read due to their names (javascript.d3.snippet). 
According to the doc:

```
    .../snippets/<scope>.snippets
    .../snippets/<scope>/<name>.snippets
```
Where scope is the filetype.

So, I moved all ``js`` snippets under ``./javascript``

# Coffeescript
I'm a huge fan and user of coffee. I created a ``coffee`` dir that contains 3 files:
- ``coffee.snippet``: This is the original one, plus some extra functions
- ``jquery_coffee.snippet``: This is the same ``javascript_jquery.snippet`` present in this repo, converted to coffee.
- ``anguler_coffee.snippet``: Snippets for [angular.js](http://www.angularjs.org/)