Leaflet FeatureGroup extends LayerGroup

From "http://leafletjs.com/reference.html#featuregroup"
L.FeatureGroup

Extended LayerGroup that also has mouse events (propagated from members
of the group) and a shared bindPopup method. Implements ILayer
interface.
Leaflet Icon.Default returns an object that extends from Icon

From http://leafletjs.com/reference.html#icon

"L.Icon.Default extends L.Icon and is the blue icon Leaflet uses for
markers by default."
Add $watchCollection(obj, listener) API to angular.d.ts

https://github.com/angular/angular.js/blob/master/src/ng/rootScope.js#L362

Signed-off-by: Gregory Petrosyan <gregory.petrosyan@gmail.com>
Create jquery.sortElements.d.ts
Merge pull request #1055 from flxf/LFeatureGroup

Leaflet FeatureGroup extends LayerGroup
Merge pull request #1058 from flxf/icondefault

Leaflet Icon.Default returns an object that extends from Icon
Merge pull request #1059 from sporttech/angularjs-watchcollection

Add $watchCollection(obj, listener) API to angular.d.ts
Merge pull request #1060 from tbureck/master

Create jquery.sortElements.d.ts