Add new method to Util.php

* Add new const REGEX_CAMEL_CASE_UNDER
* Add new method camelCaseToUnderscore
* Fix dockblock indentation
* Rename input parameter on functions:
 * createMachineName
 * camelCaseToMachineName
Remove auto-generated docblock
Call camelCaseToUnderscore method from Utils
Merge pull request #81 from jmolivas/utils-fixes-clean-up

Utils fixes clean up