Updates for existing SC.ScrollView unit tests.
- Fixes responder chain bug that was preventing the content view from ever getting a swing at touch events.
- Fixes a ScrollView bug where child view tiling was failing to trigger min/max recalculations when it caused a container view resize.
- A number of unit tests were failing because SC.ScrollView now updates its layer asynchronously. Fixed these by cheating and triggering the update synchronously.