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
Remove sites from connectors if not in network admin
Space police
Merge branch 'develop' into issue-484-select-ui-only

Conflicts:
	includes/list-table.php
Maintain separate query args for connector and context in list table
Remove end date for Today date filter
Remove the initial query to get available date ranges
Add proper docblock to instance function
Reflect change of drop() method on tests
Add data migration for the context removal update
Change plugin version to 2.0.0