Cleanup merge issues in SC.View
Cleanup merge issues in SC.View

- commented out cacheable() is no longer needed because the related bug has already been fixed.

- changes to updating layer on visibility change were rejected because they are too inefficient.  A alternate tweak is included that should fix the same issue.

- changes to prepareContext() were rejected because the removed functionality.  Looks like changes were stylistic anyway.

Eloqua/sproutcore,Eloqua/sproutcore,Eloqua/sproutcore