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
Creating report generator lib
Adding initializers and prawn
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
Merge pull request #8 from gotar/56-extending-license

56 extending license
76 create empty Contest controller
74-added haml-rails to gemfile

74-changed-application.html.erb to HAML
[#29] Add basic user model
Merge pull request #11 from gotar/29-create-model-user

[#29] Add basic user model
Merge pull request #12 from gotar/76-create-contest-controller

76 create empty Contest controller
Merge branch '74-install-haml'
#47 Add header with menu