Got the integration tests working with RSpec + Capybara

Using Selenium for most of the test.  Kept the tests as close as possible to the originals, though I had to fudge the delete upload test to get it to play with Capybara properly.

Signed-off-by: Nathan Lowrie <nate@finelineautomation.com>
Removed all of the markdown features.

We are going to integration with spree_editor plugin.

Signed-off-by: Nathan Lowrie <nate@finelineautomation.com>