Fixing two dashes merging into mdash in README.md

Eosc producer interface

Fixed issue 283 where node crashes if type are empty in Abi contract

Adding table of contents for README.md

fix cmake error on macOS

Feature/175 async transactions

Fixed problems with doxygen groups and submit latest generated version

Contract integration test

Doxygen for wallet and currency contract.

Perfect README.md

Add Access-Control-Allow options

- Remove reference to the line that p2p is currently not implemented.

Improve code block highlighting as well as some other minor details.

P2P Linux platform fixes

Fixed formatting of GITHUB_USAGE_PROCESS.md

Changing travis to perform an out-of-band build

fix issues with missing construtors that strangely does not break locally even though it really should.  ref EOSIO/eos#175