* Remove duplicate import
* Move `ASLayoutController` related code out of CoreGraphics+ASConvenience
* Further cleanup
* Move private layout files to Privat/Layout
* Move ASLayoutElementStylePrivate into Private/Layout
* Further cleanup
* Move tvOS related files to tvOS folder
* Further cleanup
* Improve ASDimensionMake via NSString
- ASXCTAssertEqualDimensions
- Add support for "auto"
- Assert if given an empty or invalid string
* Address comments
* Add ASCGFloatFromString and ASCGFloatFromNumber
* Rename CGRect+ASConvenience to CoreGraphics+ASConvenience