Rename some variables
Explicitly link contexts to connectors
Add parent / child option support, and add connectors as parents to the context dropdown
Remove sorting, we can do sort later
Remove empty connectors from the context menu
Choose connectors or contexts from the contexts menu
Convert if logic to switch statement
Fixed a couple of small bugs
Better optgroups.
Change switch statement to if else
Merge branch 'develop' into issue-484

Conflicts:
	includes/connectors.php
Merge branch 'develop' into issue-484
Remove stream_context table
More major context table changes, including an update script
Fix errors
Revert to 9699974
List table changes to group connectors with contexts
Better args for filter_select
Remove js relating to optgroups
Remove more js relating to optgroups