Prepare for integration specs by namespacing of spec:unit

* Moved all unit tests to spec/unit
* Moved all 'fixture' rails apps to spec/fixtures
* rake spec:unit task, and is now default
First attempt at AWS integration test suite
Ignore tmp
Add travis.yml ENV
Use different travis.yml ENV syntax
Run integration specs by default
Use 1.8.7 hash syntax in specs
Use a fog 'prefix' to allow test sync runs to be ran in parallel
Merge integration-tests into master
Version 0.5.2, improve defaults and docs, add integration specs and more