fix exif_extractor
filter date_time_original with start and end_date
fix some sidebar infos
paginate camera view
WIP Events
WIP
Remove Camera Events and Event Sequences
Merge branch 'master' into time_scope

Conflicts:
	app/controllers/photos_controller.rb
	app/models/camera.rb
	app/models/photo.rb
	app/views/cameras/index.html.haml
	app/views/layouts/_sidebar.html.haml
	config/routes.rb
	db/schema.rb