IMAPSync Formula for Homebrew

This is a Homebrew formula for imapsync, which is copied over from an unmerged Homebrew fork by budrick. To install open up a terminal:

1. Type brew tap simonrice/imapsync to add this repository to homebrew.
2. Since homebrew doesn't manage perl dependencies, run [sudo] cpan -i Authen::NTLM Mail::IMAPClient.
3. Finally, brew install imapsync to install imapsync.