message: put blockstack library in the place where we expect it to be found in the integration test
diff: BLOCKSTACK_BRANCH="rc-0.14.2"
  +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
  +
  # get bitcoind
  sudo add-apt-repository -y ppa:bitcoin/bitcoin || exit 1
  sudo apt-key adv --keyserver hkp://p80.pool.sks-keyservers.net:80 --recv-keys F76221572C52609D
  