Address review comments; fix up content type logic in messageGenerator.js
Checkout commit; IMAP mostly works with the "good" messageGenerator
Improve the messageGenerator interface and clean up the ActiveSync fake server's interface for storing messages
Remove fake account entirely and fix test_compose.js for IMAP
Fix some IMAP tests
Fix more IMAP tests (just test_imap_mime.js left!)
Fix the last broken IMAP test!
Be paranoid about getting the right body part in test_imap_general
Merge pull request #195 from mozsquib/as-message-generator

Use one version of messageGenerator throughout the tests