Reduce to nonrecursive make.
Add parallelism to libbitcoin project installation.
Revise install script to use 'make -j1' for travis builds, libbitcoin fork of protobuf.
Merge pull request #21 from pmienk/develop

Rationalize Makefile.am
Merge pull request #22 from libbitcoin/develop

Develop
VS import props for _protocol.
Merge pull request #23 from evoskuil/develop

VS import props for _protocol.
Merge pull request #24 from libbitcoin/develop

Develop