❤ initial import ❤
remove index.html
add twitterbootstrap, pdfkit and database gems
add html example certificate
use twitter bootstrap for css, js and application.html

* add base.css.scss with basic boostrap styles

* update application.html with basic bootstrap page layout
generate welcome controller
use welcome#index as root path
add copy to homepage
generate certificate scaffold
remove unused certificate routes, views, controller actions
add link to create certificate in homepage
update certificates#new controller code and view
update certificates#create controller code
add certificate model validations
add flash messages handling in application templtate
add erb version of  example certificate template
update certificates#show controller code and view
add pdf format representation of certificate#show action
improve site appearance via css
update README with documentation