Initial commit

Removing unused files, code and comments, left by rails_apps_composer gem.
Permalink generation algorithm

With help of radix gem it is possible to convert any number to a N-based and than translate to the given alphabet. That allows to sequentially generate all possible combination of permalinks starting from short by just increasing a seed value.
Home page of the application.

Cucumber scenario ensures, that application is successfully rendering main page with input field to enter URL to be shortened. Implementation is a stub.
Accepting URL and shortening it. No persistence yet.

Permalinks controller accepts an URL in create action, generates short version and redirects to show action. Since there is no persistence yet, application uses url.hash as seed value (to be able to correctly test behaviour).
Enabling travis-ci.org builds