search: change in templates inheritance schema

* Makes index_base.html and results_base.html
  inherit from searchbar_frame.html instead of
  page base.html to share the search-bar.

Signed-off-by: Kamil Neczaj <kamil.neczaj@cern.ch>
Reviewed-by: Javier Martin Montull <javier.martin.montull@cern.ch>
search: search bar adaptation to typeahead 0.10

* Makes the parser configurable.

Signed-off-by: Kamil Neczaj <kamil.neczaj@cern.ch>
Reviewed-by: Javier Martin Montull <javier.martin.montull@cern.ch>