Ensure jira issues have projects

Weird things happen if jira issues aren't associated with a specific
project. This commit makes sure that issues will always be associated
with one.
Refactor Jira issue class
Add labels field to jira issues
Merge branch 'jira-labels'
Use null delayed job scaler if RACK_ENV is development
Add project class and db migration
Remove unused requires
Add thor as an explicit dependency
Reorganize and reindent the webhook setup
Deduplicate DB setup for rake tasts
Remove dead code from Rakefile
Add thorfile to interact with project db settings
Modify jira pull requests to respect DB specified project and labels
Correct error in issue webhook id query
Merge branch 'project-config'