update Gemfile.lock to reflect 0.5.3
remove dummy app

We're not supporting including leap_web as a gem right now.
move braintree initilializer into core

it needs APP_CONFIG to be loaded and was failing due to that.

Also this sets up some configuration options. They might only be needed if the billing engine is used but they should not be nested in there never the less.
backport bootstraps 3.2s list-inline

list-unstyled comes for free
Enable unblocking handles in identities tab

There's an identities tab now for admins that will allow unblocking blocked handles. It should be easy to expand for aliases and forwards and other types of actions such as editing.