complete SearchDownload in frontend
styling for download generation modal
poll action added to DownloadsController

Conflicts:
	app/controllers/downloads_controller.rb
	config/routes.rb
	test/controllers/downloads_controller_test.rb
Merge branch 'download_search' into complete_frontend_search

Conflicts:
	app/controllers/downloads_controller.rb
	config/routes.rb
	test/controllers/downloads_controller_test.rb
Merge pull request #121 from unepwcmc/complete_frontend_search

Complete frontend for search downloads