Update ol from vector-api branch

https://github.com/openlayers/ol3/commit/a836d6924dfd3b7af0a4108cac075e90e083d593
Draw clicked features using new vector-api. Put style management into a service
Draw features using new vector api (tooltip, recenterOnFeature)
Rename function, more service like interface
Merge pull request #851 from geoadmin/dev_styles_for_vectorapi

Drawing features with new vector api