Added new table for countries to optimize searching

modified:   app/models/activity.rb
new file:   app/models/country.rb
new file:   db/migrate/20130615173506_countries.rb

Updated seeding data accordingly
modified:   db/seeds.rb
Fixed seed file error when new element created
Yelp rake task modified to include new country relation
Updated other rake tasks with new country table
modified:   app/models/country.rb
modified:   db/seeds.rb
modified:   lib/tasks/save_alltrails.rake
modified:   lib/tasks/save_everytrail.rake
modified:   lib/tasks/save_transit_and_trails_trailheads.rake
modified:   lib/tasks/seatgeek.rake
modified:   lib/tasks/sfgate.rake
Updated tests to match new allocation.

Test added on country model
deleted old non selected rake task lib/tasks/eventbrite.rake
Merge branch 'data_sorting'