Add project description, contributing notes and license.

+ TODO: Deploy "terms" template to production environment.
Use AGPL and CC license
kill Trello for public things, and point people to GitHub's bugtracker
admin/user: add functions to confirm/suspend a user account

Use private active admin methods to confirm/suspend user accounts. Add
buttons to reach these functions to a sidebar of the 'show' view.
Merge pull request #16 from zonque/feature/project-description-and-license-42

Feature/project description and license 42
Merge pull request #17 from zonque/user-admin-confirm-suspend-279

admin/user: add functions to confirm/suspend a user account