Guide users to fix major version, since we're planning to release a backwards-incompatible change

See http://guides.cocoapods.org/syntax/podfile.html#pod
and http://semver.org/
Merge pull request #42 from YUKAI/readme-fix-major-version-number

Guide users to fix major version, since we're planning to release a backwards-incompatible change
accessor method for software revision string
Merge branch 'master' of github.com:YUKAI/konashi-ios-sdk into version_string_uuid
change notification name like cocoa foundation
use constant
fix compile error
fix conflict