68-install-bootstrap-sass

I installed and prepared `bootstrap-sass` gem for future usage. Also replaced application.css with application.css.scss and clean it up.

If we decide to use Sass we need to giveup of using sprockets with css files because none of other stylesheets will be able to acccess Bootstrap mixins and variables.

Also added required dependency line in javascript manifest.
31 Create model Contest
Merge pull request #4 from gotar/31-create-model-contest

31 Create Contest model
Merge pull request #6 from gotar/68-install-bootstrap-sass

68-install-bootstrap-sass
Creating report generator lib
53-create-controller-Payments
53-create-controller-Payments