Question about Mail gem support

[dmitrizagidulin]

Hi Frederik, I'm in the process of modifying this library to work with the Mail gem (https://github.com/mikel/mail ) instead of TMail, since the Mail library seems to be overwhelmingly recommended for Ruby 1.9+ instead of TMail. I'd like to make a pull request in case anybody else finds this useful, and so have a couple of questions:

1. Would you like this code / would you accept this PR?
2. If so, what's the best way of handling changing out TMail for Mail? Should it just live on a separate branch as a wholesale change? Should I parametrize it somehow, so that users could use either one?

Feedback/advice appreciated.

Dmitri