Discard uninformative lines in the syntax cop

Sometimes Ruby would spit out lines of the source code
in the error output of the process. We certainly cannot
extract anything useful from them so we should just discard them.
Version bump to 0.4.5
Reintroduce per directory configuration.

This also means that "cops on duty" will mean all cops, including
the disabled ones, because we present it at the beginning and it can
potentially be a different list of cops in different directories.
Merge pull request #57 from jonas054/bugfix1

Reintroduce per directory configuration.
Merge branch 'master' into default_files