Commit README.md
Commit NSDictionary+ST
Modified README
Modified LICENSE
Added how to install.
Added return code.
Modified README
Mofidied comments.
Added methods for data and timeintarval.
Change category name to STHelper.
Added method for various types.
Added methods for various types.
Added test code.
Add NSMutableDictionary+STHelper
Modified LICENSE
Modified README.
Merge branch 'rename'