add pg_search
add searches controller
add pg_searcher
add partials for results
show link in search results
add search form
add page_activity to search
fix union path
show events in search results
paginate search results
show messages on search page
update search forms
add breadcrumb for search page
Merge branch 'feature/full-text-search-69' into staging

Conflicts:
	app/controllers/web/searches_controller.rb
	app/repository/activity_repository.rb
	app/views/web/searches/_union.html.haml
	app/views/web/searches/show.html.haml
	app/views/web/welcome/index.html.haml
	test/functional/web/searches_controller_test.rb