Added gulp build to create dist files

I wanted to use crevasse but manually injecting dependencies in the <head> can be boring

I created a gulp file to build 2 min in the dist folder.

* crevasse.min.js
* crevasse.full.min js, contains all dependencies except jQuery

I can improve the task to compile the file from the coffe but since that was done by the CakeFile I did not implemented that.