Remove redundant _LIBS, _CFLAGS and PKG_CHECK_MODULES.
Normalize install script, remove /usr/local pre-install cleanup.
Correct script error.
Merge pull request #86 from pmienk/develop

install script normalization
Merge pull request #87 from libbitcoin/develop

Develop
Comments
Update local and NuGet dependencies.
Reference protobuf NuGet dependency.
Remove sighash acronym, update taxonomy info.