Expanded support for attributes other in the angular-leaflet-directive

Hi,

I am building and app with leaflet and angular, and i am planning to use this directive in the future to integrate all the leaflet functionalities wrapped in angularJS.

I did some minor changes to the code to make it support custom tiles, custom attribution, and inline styling height,width of the map for quick use.

Hope they can be useful  :+1: 
Regards,
Daniele