Create organizations table
Skeleton organization model
Set up pivot tables for relationships

Created pivot table for Event/Organization m2m relationship
Set up event/organization m2m relationship in models
Migration for user/organization m2m relationship
Fixed and finished user/organization m2m relationship
Use has_many through instead

Re-did migrations to use has_many :through with separate model
Update models to reflect the new relationships
Added indices to new tables
Merge pull request #14 from Pitt-CSC/organizations

Set up organization model and associated many-to-many relationships.