Change project name to rmail-sup

This fork is a sup-compliant rmail with compatibility for ruby 1.9.1+.
Only critical maintenance is expected (The future is mikel/mail)
Bump to 1.0.1
Merge pull request #2 from strzibny/regexps-ascii-8bit-fix

Fix encoding of regexps for Ruby 2.0
Merge upstream (already included)
rakefile: package gem on ruby 1.9