added simple form gem
moved static method for page model in external module
show contribution tab for more namespaces
removed contribution module
work with simple forms
removed unused dev gems

replace webserver
restored binding_of_caller for better_errors
updated json gem
another format for using github gems
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