Add permissions scopes for classifications
Add Access Control to Classifications Controller

Closes #139. Sets up for #1
Fix classification visibility query
Fix formatting error
Fix typos add a default value to completed
Temporary Workaround for ActiveRecord Bug
Merge pull request #144 from edpaget/classification-permissions

Classification permissions
missing schema migration from #144

reverted here: https://github.com/edpaget/Panoptes/commit/e436100dd5dba0f6bff28ad843881c17381cad57
add specs for user's required admin value
remove unused roles factory
spec out the classifications required completed value
Merge pull request #145 from camallen/missing_migration

out of sync schema db with migrations