incremental improvement for the p2p networking

Wallet start

fix Could NOT find GMP (missing: GMP_LIBRARIES GMP_INCLUDE_DIR)

Stub out simple dice contract.

Build on Travis CI

Hi Thanks for catching that. I'll be adding a substantial amount of documentation to both protocol.hpp and net_plugin.hpp soon. 

The word is misspelled.

Extend abi serializer

* Fix asks table name
* Handle open_orders per account

As of now, almost all the ingredients are in place for authorizing
transactions. We check that the transaction bears signatures sufficient to
satisfy its declared authorizations, and as we execute the transaction,
we ensure that the declared authorizations are sufficient to satisfy the
authorizations required by executing the message handlers, and we ensure
that all of the transaction's declared authorizations were used.

What's not done:
 - Detecting/rejecting duplicate signatures and unnecessary signatures
 - Choosing the correct permission level when a message handler requires
an authorization

Choosing the correct permission level is the big ticket item. To
implement this, we need to implement a missing chunk of system contract
functionality, specifically around defining links from a user's
permissions tree to contracts and message types.

There is a problem right now with the run_test.pl script. For some
reason the eosd instance launched by perl is now failing to initalize
the shared memory, although running the exact same command line from
the shell works fine.

Use a Find Module for GMP

- Static (archive) library should be used
- libgmp dependency needs to be accounted for
  - this is probably not in the right place?
  - future work: should libgmp also be static?