removed unused part of readme
refactored contribution process
show repo-tab for concepts
renamed nice_wiki_url to url

format for snapshot module
restored wirble gem
fixed routes for simple form
tested app with ruby 2.1-preview1
removed empty file
renamed home styles
added file with sass mixins
text
removed unused style
renamed mixins
added angular.js to the project
renamed tab contribution to repo
simplified logic about contribution
removed unused routes
js for bootstrap tabs
added js for bootstrap tabs to manifest
functionality for interaction with git hub in user model