Update travis to containers.
only load order for specific actions

according to https://github.com/spree/spree/blob/master/backend/app/controllers/spree/admin/orders_controller.rb#5

fixes #242
Login nav menu for Boostrapped Admin
Removed unnecessary login nav information
bump ruby and cancan is part of core.
fix specs
Onto 3 and new ruby requirements.
Update for bootstrap frontend.
Let spree_core.gemspec handle ruby version.
bump ruby and cancan is part of core.
remove failing spec, the banner is no longer here. No need to test something that is no longer here. ref: https://github.com/spree/spree_auth_devise/pull/5