Trouble codes added

Trouble codes added in good format.
Merge pull request #11 from kuburoma/master

Added support for Trouble Codes.
[maven-release-plugin] prepare release obd-java-api-0.5
[maven-release-plugin] prepare for next development iteration
Updated usage instructions.
Removed unused Guava dependency.
Fixes #14
[maven-release-plugin] prepare release obd-java-api-0.5.1
[maven-release-plugin] prepare for next development iteration
Updated library usage to version 0.5.1.
Removed NODATA check in commands since exception will be thrown
Added unchecked exceptions for errors in responses
Added ObdRawCommand for raw command execution