Add a real Rails 3.0.20 app for testing
Remove RVM flags from Guardfile (doesn't work)
Convert integration test to use the real Rails 3.0 app

This isn't very efficient with regards to runtime, but it beats having
to run the entire suite for each rails version, and it brings better
coverage by being truly integrated.
Add a real Rails 3.1 application and add it to integration tests
Add a real Rails 3.2 app and add it to the integration tests
Improve test to not require global state from spec_helper
No more global Rails application stub from FilesystemProvider specs
Remove fixtures
Remove Rails from most of the specs

ActionMailerExtensions still needs a full Rails integration, but that
can be fixed by changing how Roadie attaches to Rails.
Change documentation links in README [ci skip]
Merge branch 'master' into experiment

Conflicts:
	lib/roadie/inliner.rb
Add note to README about what this branch is all about
Add a Rails 4 application to the integration tests
Add script file to handle embedded bundles
Update embedded bundles
Remove Appraisal in favor of embedded apps
Add a Rails 4 application with the asset pipeline disabled
Add a Rails 4 app with precompiled assets; with pending specs

They are all pending right now since they aren't actually green. This is
the place I've tried to reach for a long time now. I now have an
excellent opportunity to experiment with different implementations and
be sure that no other version of Rails breaks.
Start working on Roadie 3
Add a new AssetScanner to handle embedded/referenced assets