Added support for WMS layers
Merge pull request #110 from JaumeFigueras/layers

Added support for WMS layers
Added support overlays with xyz and wms layers
Forgot jshint, solved a couble of errors
Merge pull request #112 from JaumeFigueras/layers

Added support overlays with xyz and wms layers
Merge branch 'multilayers'. Functionality by @JaumeFigueras as explained here:

https://github.com/tombatossals/angular-leaflet-directive/pull/112

Conflicts:
	src/angular-leaflet-directive.js