Open Frames using query string parameters

[SteAllan]

Change Frames (Manipulation Panel, Bottom Drawer etc.) to open and close by detecting query string parameters. This will allow the user to press the back button in their browser to close a frame. See #81 for more details.

[SteAllan]

Initial thought is the query string could be as follows:

?frame=manipulation_panel, ?frame=bottom_drawer etc

[SteAllan]

We'll need to make sure the user is given a warning message when the try to close a Frame without saving any changes.

We'll also need to gracefully handle when they go forward through their browser history: ideally we don't want the user to open an empty Frame.

[nathanhebe]

Basic working use of query params to record state of manipulation panel & bottom drawer. When opening either of these, application controller appends a query string, when the browser triggers the back/history the state changes and an observer in application controller closes the modal if necessary.

Additional functionality

• build an events system into modals that allows nested components to have teardown functionality
  • e.g. an edit form within manipulation panel is notified when it's being closed and can prevent/delay until it's asked the user if the want to save their changes
• clean up the url when the query param isn't necessary