I made changes to UIKeyChainStore.h & UIKeyChainStore.m inorder to be ab...

I wanted to use the lib with swift but couldnt access the objective c class method in swift. I just created some ample functions. Since class methods class  like
```swift
  UICKeyChainStore.keyChainStoreWithService()
```
 is not accessible in swift. I created getKeyChainStoreWithService class method instead to call keyChainStoreWithService underneath. So you simply use.
```
 UICKeyChainStore.getKeyChainStoreWithService() 
```
 in swift. Let me know if you have any other workaround instead of this.