Copying configuration values of NSString

I've begun using the keychain for local password storage and in doing so uncovered an issue. When using:

[ObjectiveResourceConfig setPassword:myStringValue]

The string was not being copied or retained by ObjectiveResource. In my case the NSString was being returned by the keychain layer with a return count of 1 and set to autorelease, which means it is not long for the world unless the code which needs it to stick around copies or retains it. As a result my app would crash as soon as an attempt was made to retrieve the value that was set. To fix this I implemented a copy-property pattern on all four of the string values currently supported in the configuration:

http://github.com/adamalex/objec...

I verified this fixes the issue. I believe it didn't come up before because in most cases NSString values are optimized with an artificially-high return count to cause them to act more like constants. This is not guaranteed however and I found one of the edge cases! As long as the code which is responsible for the string copies or retains it then it will definitely be available when needed.