Extended Rules to support Modern Perl

Extended Rules to support Modern Perl in Exuberant Ctags
Here are some additional regular expressions to support more Perl symbols. 
I didn't think ctags supported `\s`, the other patterns in this file all use `[ \t]` instead, perhaps we are using an outdated version, but I wasn't getting it working using this file https://github.com/kraih/mojo/blob/master/lib/Mojolicious.pm with these changes.