Patch 1

Hi! Nice wrapper! :+1: 

I changed the `document.getElementById()` calls to use the $elem object included in the link function of angularjs. This is considered a better practice as it decouples your directive from using the DOM directly.

I also added a .gitmodules file (you probably forgot to commit yours). This is necessary to push the contents of the submodule repositories when you git clone.


Cheers! :)