Merge pull request #31 from libbitcoin/develop

Remove unused boost component from build.
Merge pull request #33 from libbitcoin/develop

Merge develop.
Update README.md
Update README.md
Merge pull request #37 from evoskuil/develop

Add command aliases. (reverted from commit 0a42d2a...)
Merge pull request #38 from libbitcoin/develop

Add command aliases. (reverted from commit 0a42d2a)