Fix args passing & Add dom arguments support

[aslafy-z]

I originally did separate commits but I fckd up and I can't open two PRs anymore. sorry for this.

This fixes #5

BREAKING CHANGE: Force the use of an array instead of infinite arguments
eg:

 LukesLazyLoader.load(['file1', 'file2'])

instead of

 LukesLazyLoader.load('file1', 'file2')

It also bring support for advanced source input, it can now be:

• a string
• an object

   {
       args: object[string, string] // args to pass to dom
       url: string // url to use
   	 type: string // 'css' or 'js', replace auto detection 
   }