Added originalHeight and originalWidth to view frames
Improved scroll view scaling to pivot around center of viewable area
Added tests for scroll view scaling changes
When adjusting scroll offset, prioritize using minimum offset to avoid miscalculation
Added new test for when content view's layout is fixed to the parent view. Refactored the tests to use SC.ControlTestPane/
Disables ScrollView alignment properties in the case of flexible layouts, with which they presently conflict.
Updates changelog.