Refactoring

 * Refactor MyGists::Search by using Active Support to delegate to expose WillPaginate methods on scope
 * bundle update
 * Upgrade Draper Decorators
   * Use source to reference undecorated model instance
   * Draper no longer requires decorates macro
   * Inherit from Draper::Decorator
   * Remove generated comments within decorators
   * Refactor decorator specs to use source attribute in order to send messages to undelegated model methods
   * Add ApplicationDecorator and PaginationDecorate to globally delegate WillPaginate methods
   * Delegate GistDecorator#profile
   * Delegate ProfileDecorator#user_id for Ability
 * Link profile gravatar to users github profile