Closes #15: Replaced all system.err messages with logger messages. Also, added greater capabilities for attribute chains and made several other minor internal improvements.
Fixed exception problems within last commit.
There was a problem with the commits. This commit actually commits all of the stuff in the commit that closes #15. Apologies for the mess.
Completed the README's user field related sections. Improved logger error messages in the attribute chain resolution process. Corrected some minor bugs involving null values and casts.