Added basic model and migration for groups.
Changed the landing page type.
Merge branch 'sass-refactor' into groups
Added basic page for creating a group.
Added functionality to add a group with options.
Added group field and relationship to question.
Added check private method to questions
Created method for checking is questions are public
Improved trending action logic.
Added some basic layout styles to group.
Decided to make every group a private one.
Fixed placeholder on ask a question.
Created method for generating random code.
Added share the group link.
Improved layout of the group page.
Improved responsive design for groups.
Updated the links on the menu nav
Added method to check for persistent path redirects
Groups can now be joined from logging in order signing up.
Improved the styles of flash notices.