Improve log messages when deploying a registry

[njgheorghita]

re: #49 (comment)

Not needed for this PR but the UX for this would be significantly improved if it gave continuous feedback as the various things happened.

Deploying new registry to ....
Broadcast transaction 0x1234... deploying registry contract....
Waiting for tx to be mined....
Transaction included in block #81234234
Doing other thing....
...