Adds Twitter gem to Gemfile, updates Figaro env_vars, and sets Rest Client as global (for now).
Updates Twitter initializer to use non-deprecated variables.
Moves Twitter initialization into TwitterUtils module; autoloads #{Rails.root}/lib directory.
Adds method to follow all friends; adds custom Twitter API rate limiting retry logic.
Adds Travis CI integration for auto-remote builds on commits / pull requests.
Fixes CI configuration file to run rake db:test:prepare on initialization.
Changes order of CI rake tasks in order to accomodate correct remote build order.
Resolves merge conflicts prior to merging back to master [from add-campaign branch].