begin restoring the test_api contract interface, pull results out of the apply_context into chain controller

STAT-153(GH-682): Remove signed_transaction from transaction_object so it can be stored in shared memory

by --block-interval-seconds chain_plugin command line option. #733

- adding block merkle root incremental calculation and validation

save and restore pending transactions when pushing blocks, add transfer helper to tester, and adding get helper

Authenticates producers using producer keys, optionally authenticates
non-producing peers using configured keys, and further optionally
allows unauthenticated connections.  Includes launcher support.

Also fix bug when a 100% producer node started up after a long (>64
second) delay and thought it's a 0% node.

Add additional information for debugging Travis builds.

Partial implementation of block_timestamp

block_timestamp producer round temporary changes

Also since the API changes creeped into so much code,
decided to just go ahead and change the remaining code. #624