Add seed data
Merge pull request #15 from Pitt-CSC/seeds

Add seed data
Set up organization controller
Added route to controller and basic index template
Added empty page for showing organization
Set up organization user interface

1. Set up nested routing with Organizations->events
2. Set up some controller methods to ensure the right people see the right orgs
3. Created a few forms and necessary views
4. Cleaned up routing and other controller methods that are no longer used