Gemfile + gemspec updates for 1.3
Removing decorator loading from engine. No decorators here.
Code cleanup for 1.3

Code fix enables us to cleanup a workaround
https://github.com/spree/spree/commit/5e57b732406c3a2debeb4a06c874cd9e7d3f7494
Adding pry-nav to test Gemfile
Adding initial specs
Improving specs to test promotion ordering
tab to space conversion

My rspec syntax is funked up