Summary:
When trying to integrate this into an Xcode project that already included CSSLayout.[c|h], we were getting a linker error.
Upon digging in, I found out that Xcode was becoming confused because the imports of the uikit library and the c library are both `#import <CSSLayout/CSSLayout.h>`. So, it needed a new name.
Reviewed By: emilsjolander
Differential Revision: D4162621
fbshipit-source-id: b5f7624eb29f1b9eaebbed5104ec9ea8a12ad2e5
