Merge pull request #89 from apoloval/fix/config

Fix some config properties
Extend MockSupervisedActor

Add methods to easily check for restart/stop situations.
Improve error message when retrieving the blockchain actor
Fix initialization of BitcoinPeerActor in broker-side
Fix 110% issue
Merge pull request #90 from sortega/build_break

Fix build break and nitpicks
Make WalletActor create new key pairs
Use a fresh key pair on exchange initialization
Introduce common-akka module
Introduce utility for the ask pattern
Merge pull request #91 from sortega/task/134_keypair

Take a new key pair from the wallet actor for the exchange