archiveObjectToDocsDirectory
unarchiveObjectFromDocsDirectory
NSKeyedArchiver and NSKeyedUnarchiver categories.
Archiving and Unarchiving macros.
Updated README.
podspec to 1.1.5 (reverting to 0.1.2 style)
Removed .m for Archiving.
Optimizations.
Tests for nil object and using filename.
Updated README.