remove useless file
fix migrations to work in more use cases of upgrades
update .travis.yml to change supported Ruby version

As we are preparing for master to be Rails 4:
- do not support 1.9.2 any more (not supported by Rails 4, please upgrade)
- do not allow Ruby 2.0 builds to fail

If you need to upgrade to Rails 4 anywhere and upgrade Ruby, please move to 2.0 ASAP.
add some FactoryGirl configuration

- it makes it possible to call just `create(:my_factory)` instead of
the full thing
add authtentication mock for controller specs
add route loading for controller specs
add controller specs for Monologue::Admin::Post

This is currently failing locally for me, but I have no error output or
anything so pushing that in the hope that Travis will tell me something
different or new?

:pray:
upgrade dummy's Rails version