Paver: fail if pylint/pep8 violations threshold is breached.

I think that search criteria is too loose and will find false positives. (Since violations can appear as multiple lines, such as 'duplicate code' violations, it's conceivable some lines start with those characters...just as an eample). 

re.split can't use a compiled pattern, either, which is one of the reasons I'm not compiling the pattern. I think ensuring the string can split into 4 pieces is a good way to go, and it gives parity against the Jenkins plugin. Any suggestions on compiling a pattern but still confirming a line splits into 4 parts?