Frontend User auth

This pull request introduces
* CurrentUser model
  * Stores username and password in cookie (for now). 
  * Authenticates to server using Basic Auth
  * currentUser is a global accessible variable to get the currentUser object. Do not instantiate a CurrentUser model on your own.
* Login View
* Dashboard View
  * Really blank for now

Other changes made
* Sub router instantiation migrated into another object, `Eduki.Routers.Eduki`
* Backbone BasicAuth library imported
* JQuery cookie library imported
* Bootstrap moved into lib directory

@omjolie 
@abboudm