Various changes
Fixed individual task show page.
Removed database.yml from repo, corrected database.yml.example
Merge branch 'approving_credits'
Updated README with helpful commands.
README.rdoc updated and rails_installer.sh included
Created role table and added association into User model.
Merge branch 'roles_table'
Change to using postgres over sqlite3
Migrations to user and role tables
Model changes
DB changes, seeding admin data