Add decorations directive to add support for Leaflet.PolylineDecorations.
Add PolylineDecoratorPlugin to leafletHelpers service.
Refactor setDecorationOptions so that it calls setPaths and setPatterns.  Add unit tests for decorations directive.
Add example using decorations directive at examples/decorations-simple-example.html.
Remove isDefined(markers) check in markers directive.  With this check, I can't get any markers to display.  Without it, it works fine.
Merge branch 'master' of https://github.com/manleyjster/angular-leaflet-directive into manleyjster-master

Conflicts:
	dist/angular-leaflet-directive.min.js
Merge branch 'manleyjster-master'