Adding documentation
Update README.md
Update the initialization and compare methods
Change the file path
Add SwiftyJSON.xcworkspace
Add iOS Example
Add Dictionary methods
Delete redundant code
Speedup initialization，but slow array and dictionary methods.
Add SequenceType methods
Merge pull request #59 from SwiftyJSON/develop

Add iOS Example, Fix #57
Update README.md
Change enum JSON to strut JSON and Add literal convertible protocol
Update the test case and Add literal convertible tests
Update example
Add subscript tests
Add printable tests
Add sequence type tests
Add comparable tests
Add number setter