Added task builder and updated categories.

Created matches between yelp and local matches
lib/assets/cat.rb
lib/tasks/yelp.rake
Updated matching hash
lib/assets/cat.rb
lib/tasks/scraper.rake
lib/tasks/yelp.rake
Merge branch 'master' into yelp
Fixed Yelp rake task issue, added filter for existing activities.
modified:   lib/tasks/yelp.rake

Fixed typo in new format and added already existing update attribute method
modified:   lib/tasks/scraper.rake
refactored view and model to make it cleaner
app/models/activity.rb
app/views/categories/show.html.erb

Created partial for activity row in index
app/views/categories/_activity.html.erb
Added split between dated and undated activities in activity helper
Updated controller accordingly
modified:   app/controllers/activities_controller.rb
modified:   app/helpers/activities_helper.rb