Prototype scroll stuff.
@gwynne FIXED IT!
50 seems like a better magic number for this. feels good.
Stop scroll events from propagating when the interface is active.
Merge branch 'develop' into numist/event-system

Conflicts:
	Switch/SWCoreWindowController.m
Enable/disable scroll based on interfaceVisible and don't wrap the selector.
Merge pull request #74 from numist/numist/event-system

Scroll events should move the selection.