ok, lists of addresses need to be a list in the call to sendmail(),
    but when MIME encoding the message (headers), the To: line must be a string. And there must be a space after the commas.
using the right variable...
Merge pull request #2 from manos/fix-smtp-usage

ok, lists of addresses need to be a list in the call to sendmail(),
json.loads here is quite silly. wtf.
Merge pull request #3 from manos/noloads

json.loads here is quite silly. wtf.
allow the disabling of email/pagerduty alerts via a disable_alerts() method.
Also, pep8.