Keychain method not called addItem and adds “-w” to service

[andrewcrook]

A couple of issues

addItem in documentation doesn’t exist I presume it’s the method addPassword

The security command line string appends ‘-w' to a field
this is because it adds ‘-w ’ twice and the second the second time doesn’t add a space in front of it..

[andrewcrook]

I will take on this Issue

1. I will rename addPassword to addItem
2. I will remove the concatenation that adds the password a second time.

[andrewcrook]

Pull request #312