Fix README link.

Also add shell syntax highlighting.
Merge pull request #32 from jdutil/patch-1

Fix README link.
Fixing controller for current_order bug

unavailable.html.erb throws an error missing current_order

https://groups.google.com/forum/?fromgroups=#!topic/spree-user/mbEVVManQY8
Merge pull request #35 from nitsujri/master

Fix for digital_controller throwing an error with unavailable.html.erb
Note about improvement to create_digital_links
Running tests, and fixing breaking changes, for 1.2.3
Support Spree 1.3.x, add default unauthorized page, and organize locales.