Adds check for change of hub during creation of new topic.  It will now update the hub selection text box when this change is detected.  Also insures all proposals for the hub will not be reloaded if a proposal detail page is being requested via the proposalId parameter.  Only the proposal detail page should be loaded
Changes watch on hubFilter to only reload proposals for hub when the user had selected a new hub from the hubFilter selection box.  If the hubFilter value was changed because of a new hub being created on a start topic modal then the proposals will not be reloaded for the new hub.  The user will be directed to the proposal detail page instead as expected
Merge pull request #280 from angiedev/fix_hub_sync_bug

 Bug fix for card # 250:  Hub sync on back button