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.
Regenerate gemspec for version 0.4.5
Version bump to 0.4.6
Regenerate gemspec for version 0.4.6
Add finding extensionless Ruby files with shebangs.

By default now finds all Ruby source files under the current directory.
A Ruby source file is defined as a file with the `.rb` extension or a
file with no extension that has a ruby shebang line as its first line.
Mention flycheck integration
Mention other editors
Merge pull request #58 from lee-dohm/default_files

Add extensionless files with shebang lines to the set of default files