Minor tweaks.
Test ruby 2.1.x
Update README to reflect current branch etc.
Additional dup fixes for #483

Also rubyforge project is dead.
Refactor and fix broken specs for RSpec 3.1.x

Specs where broken in many places and used very old active record hack
for Capybara. Also swap to run specs with Phantomjs.
Add badges for 2-2-stable branch.

Also change broken md syntax.
Point to spree-contrib or it get wrong data.