Initial implementation of redshift watcher and auditor
Refactor so that new watchers/auditors are easier to add
Merge branch 'redshift' of https://github.com/Yelp/security_monkey into Yelp-redshift

Conflicts:
	manage.py
fixing reference to security_monkey.scheduler
Fixing imports and names
Adding default region for sts_connect on redshift
Removing unused code and pudb
Merge branch 'Yelp-redshift' into develop