Expose settings object to templates

This is used to give access to the bing api key for non-instance based
apps where settings.js doesn't get loaded.
Whitespace cleanup on css
Add in openlayers css
Remove instance-related controls from base template
Instance names must be unique
Add function to approve bulk audits
Remove center field, just use the bounds instead
Use actual keys for delete-permission testing
Mark instance config as 'blank allowed'

When a value is required it gets inserted into the database
automatically. This just bypasses the django verification.
Merge pull request #234 from ahinz/topic/updates

Topic/updates