Update secp256k1 NuGet references, for breaking lib change.
Merge pull request #17 from evoskuil/develop

Update secp256k1 NuGet references, for breaking lib change.
Merge pull request #18 from libbitcoin/develop

Update secp256k1 NuGet references, for breaking lib change.
libbitcoin_protocol client implementation.
Add back modified obelisk_client.
Increment version due to protocol dependency, interface breaks.
Update install script to account for libbitcoin_protocol dependency.
Update vs2013 project files to reference existing sources.
Update install script due to libbitcoin_protocol structural changes.
Add support for call variation due to absense or rationalized implementations.
Modify test to use make check.