Merge pull request #82 from pmienk/develop

client API adaptation, Makefile corrections
Merge pull request #83 from libbitcoin/develop

Develop
_protocol import props
Minor tweaks.
Merge pull request #84 from evoskuil/develop

_protocol import props
Merge pull request #85 from libbitcoin/develop

Develop
Remove redundant _LIBS, _CFLAGS and PKG_CHECK_MODULES.
Normalize install script, remove /usr/local pre-install cleanup.