IN-458 - Various updates for Idea fields
IN-318 - Add search results for idea and challenge
IN-318 - Remove idea sort by recent activity, doesn't work in test environment
Merge remote-tracking branch 'origin/cleanup' into challenge

Conflicts:
	src/idea/models.py
	src/idea/templates/idea/banner_detail.html
	src/idea/templates/idea/detail.html
	src/idea/templates/idea/list.html
	src/idea/views.py
Remove template line missed in merge 48553b8
Merge pull request #13 from m3brown/challenge

Search results, various updates for Idea fields