Added State and two State-specific exceptions to the class utils package
Fixed error logging in arcade so as not to print line numbers
Merge pull request #47 from duke-compsci308-spring2013/arcade_logger

Fixed error logging in arcade so as not to print line numbers
Merge pull request #45 from duke-compsci308-spring2013/StateUtil

Added State and two State-specific exceptions to the class utils package
Updated Example code.
Merge branch 'master' of https://github.com/duke-compsci308-spring2013/vooga into scrolling_platformer