A collection of fixes for the add layer widget

Addressed in this commit,

#776, Shows to total number of results and the currently display
 features

#683 When the user clicks on a title that layer will be added to the
 map

#777 When there are no results the next and prev buttons are grayed
 out

#780 When the user adds a layer, the map zooms to that layer's extent
Merge branch 'newMapSearch' into integration
Merge branch 'integration' of github.com:MapStory/mapstory into integration