Feature/performance caching

Hi Dan:

This pull request enables Google analytics for all page views as well as use the event tracking feature to determine elapsedTime for LHN search expand (quick_search_controller), Navigate to a object and display contents (dashboard_widget_controller) and Tree view for mappings (tree_view_controller).

Will provide the Google analytics internal UA tracking ID (not configurable) and you need to uncomment code that is marked _gaTracker.

Mouli