- Add new configuration option [datastore]mailbox.message.cap
- Modify filestore to enforce message cap if value > 0
- Filestore unit tests for message cap when enabled & disabled
- Change to DataStore.Mailbox.NewMessage() interface to allow error
return
Logging methods were renamed so they don't trigger go-vet warnings for
error() and Error() formatting.
Unit tests were updated to use new github.com/stretchr repo (was renamed
from stretchrcom)
Missing methods were added to Message mock object.