Change "muust be compiled with ARC" to "must be compiled with ARC"

Fix a typo in the error message if the user attempts to compile with project without ARC.
Fix references to wrong header file in README.
Fix Xcode 5.1 project warnings.
Merge pull request #161 from square/af/fix-code-51-warnings

Fix Xcode 5.1 project warnings.
Go 1 has been released. Update README :)
Merge pull request #180 from andybons/patch-1

Go 1 has been released. Update README :)
Merge pull request #112 from jcoleman/master

Fix references to wrong header file in README.
Merge pull request #93 from dmitric/patch-1

Change "muust be compiled with ARC" to "must be compiled with ARC"
Removed enforcement of the SRStatusCode enum for status code arguments
Merge pull request #164 from iheart2code/public_typedef

Move SRStatusCode typedef into header file
use normal close constant instead of hard-coded value
Merge pull request #157 from pizthewiz/valid-close-code

use 'normal closure' close code by default, fixes #127
Merge pull request #154 from reggie-inmotion/master

Remove errant assert(NO) in _sendFrameWithOpcode
Merge branch 'master' of https://github.com/square/SocketRocket
Make sure readyState is SR_CLOSED before calling delegate methods