Home link needs to get format from current route, not current round

[scslingsby]

Users can swap format via navigating to different route but home will always (currently) point to the activity / round's preference.

[scslingsby]

In current state, will need to pass this as data with every view returned from an Activity or Page format.

Otherwise, need to (probably the sensible solution)...

• Combine Linear and NonLinear controllers
• Use format as a route parameter
• Rethink binding of page (linear) and category + page (nonlinear) from route

#44 will be required in order to solve this one elegantly.

[scslingsby]

Closing, format to be an input parameter sent to RESTful page route (get or post), handled in other issues.