Add ARCHS_STANDARD_INCLUDING_64_BIT
Added three functions abstracting the fact that CGFloat is bigger in 64Bit land. the appropriate functions for round, floor and ceil are ifdef'd around __LP64__ checks.
Implement the three new CGFloat methods within TTTAttributedLabel
use MAX rather than fmax to avoid warnings on 64bit
encodeWithCoder: encode NSNumbers rather than float values for better 64bit support.
AttributedTableViewCell CGFloat rounding set behind _LP64__ ifdefs
Update README mentioning arm64 compatibility
Merge pull request #279 from jessedc/64bit-support

Add support for 64 bit architectures