Created a search-menu template and corresponding controller.
Moved functions out of SearchController to SearchMenuController.
The two controllers share information through ngModel.
Set up bundle.json so that the search bar could
be a mct-control, but left the control itself
commented out because then CSS styling would not
work due to lack of access to parent elements.
Moved the elasticsearch provider to
platform/persistence/elastic. Then moved
the search aggregator and the generic
provider into a services folder within
the search folder.
