Merge pull request #331 from sortega/issue/131_bug

Fix #131: Payment proofs are not resubmitted by the buyer
Provide a new Stats view to provide statistics graphs

So far, the order book graph only provides fake data.
Move `Market` class to `model`

It was wrongly declared in `protocol`
Make `OrderBookChart` to retrieve data from Coinffeine app
Merge pull request #332 from apoloval/task/cf-117

Add a new stats view with the order book
Cleanup of undesired steps in setup wizard

This change removes the encryption password step of setup wizard and replaces
the OKPay account retrieval steps by another one which requires the API
parameters.
Merge pull request #334 from apoloval/task/wizard-cleanup

Cleanup of undesired steps in setup wizard
Add fish-for-message methods to MockGateway

And rename expectForwardingFormPF to expectForwardingToPF
Hopefully fix heisenbug at DefaultHandshakeActorTest
Make MockGateway to wait for multiple messages

In a concurrent fashion which is ideal to avoid heisenbugs in tests in
which ordering of some messages doesn’t matter.
Fix heisenbug in PersistentHandshakeActorTest
Merge pull request #335 from sortega/heisenfix

Heisenfixes at DefaultHandshakeActorTest and PersistentHandshakeActorTest
Extract a base class for OrderActor tests
Make OrderActor extend PersistentActor

But not yet persist any event
Improve MockActor to capture initialization arguments
Simplify DelegatedOrderFunds into OrderActor
Make OrderActor persistent
Introduce a Delegates trait into OrderSupervisor
Make OrderSupervisor persistent
Merge pull request #333 from sortega/issue/111_order_actor

Make order actor persistent