Update dummy app for rails 4
Change gem dependencies for rails 4

Update activemerchant gem version
Change method of pay action to post method
Change routes for rails 4
Change the homepage url
Merge from master
Merge from master
Fix wrong route on payment engine register
Bump to 2.0.0
Add notes about the gem versions on README file
Fix route on review form
Require activemerchant on lib

On catarse's code we needed add the activemerchant and specify the require file to not break the application start up.
Add ruby 2.0.0 to travis
Merge pull request #1 from josemarluedke/rails4

Add support for Rails 4