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Update jquery-rails gem
Update development dependencies
Update sanitize gem
Fix CloudMailin signature digest calculation

Adopt current (deprecated) code from
http://docs.cloudmailin.com/receiving_email/securing_your_email_url_target/

Fixes #1402
Fix route to CloudMailin integration
Allow CloudMailin to skip CSRF verification
Remove commented out style
Clean up manual timeouts in feature tests
In tests, activate menus by JS instead of click
Update Rails to 4.1.6
Sync boilerplate with Rails 4.1.6
Update rspec-expectations gem
Update selenium-webdriver gem
Update bullet gem
Remove arel monkey patch
Remove last remnants of old development bar
Use modern config namespace