message: verify where circleci puts blockstack.js
diff: BLOCKSTACK_BRANCH="rc-0.14.2"
  +test -d /home/ubuntu/blockstack.js || exit 1
  +
  sudo mkdir -p /usr/share/node_modules
  test -d /usr/share/node_modules/blockstack && rm -rf /usr/share/node_modules/blockstack
  -sudo cp -a blockstack.js /usr/share/node-modules/blockstack
  +sudo cp -a /home/ubuntu/blockstack.js /usr/share/node-modules/blockstack
  # get bitcoind
  sudo add-apt-repository -y ppa:bitcoin/bitcoin || exit 1
  