Tracked mailing name in KISSmetrics

- Passed mail type to CM_Action_Email (breaking)
- Used class name in KISSmetrics event name
- Added test
Tracked the sending of mailings in KISSmetrics

- Added action verb "SEND", updated config
- Used after sending emails
use MongoCollection::count() when not using aggregation
Merge pull request #1399 from fauvel/issue-1399

BREAKING: Track mailing name in KISSmetrics
Merge branch 'master' of github.com:cargomedia/CM into issue-1400
Merge pull request #1400 from fauvel/issue-1400

BREAKING: Track sending of emails in KISSmetrics
Merge pull request #1401 from alexispeter/mongo-count-performance-fix

use MongoCollection::count() when not using aggregation