Remove FactoryGirl.lint in before(:suite)

We estimate that `lint`ing adds an extra ~300ms on a typical app we work
on for every `rspec` run, even a focused test that only runs one spec.
Until we can find a way to avoid paying that penalty, the discussion
below has landed at not putting it in Suspenders:

https://github.com/thoughtbot/suspenders/pull/299/files#r10642936
Remove before(:suite) block
Join the Heroku app in bin/setup
Don't run `FactoryGirl#find_definitions` in setup

Running `#find_definitions` in a rake task that is invoked by `./bin/setup`
loads factories twice. This causes `./bin/setup` to fail due to a
`FactoryGirl::DuplicateDefinitionError` if there are pre-existing factories.

Add a test to ensure `./bin/setup` completes successfully.
Add logging for travis
even more logging for travis