Merge pull request #2 from MuzzleFork/master

Add message option for Mandrill's subaccount
Release 0.2.3
add support for sending pure html
add readme for html mode
Release 0.2.4
fix syntax error. Doh
Release 0.2.5
fix intercepting with no message vars
Release 0.2.6
Add ability to send plain-text emails or HTML and plain text emails.