Mandrill inbound headers are a hash not an array
Mandrill doesn't always send a text entry in the email. Protect for that and html.
Refactor cc extraction to use the same method as to
Make sure the html part of the email is used when text is not present
Code style updates to make Hound happy
Make sure event[field] is an array before attempting to map it in the mandrill adapter
Update ruby version
v0.6.4