Update for capybara-webkit

Update Gemfile, spec_helper.rb
And fix simple spec from request to feature
Fix docomo_guid feature spec: move from request to controller spec
Fix helpers_spec to move to controller
Fix filter_spec to move to features
Split template_path_spec into controllers and features specs
Remove webrat, use capybara-webkit
Fix for Rails 4.1 updates
Ignore .ruby-version for rbenv