message: Do riot-web setup in a different order
  ... in an effort to stop npm cocking it up.
diff: set -ev
  -git clone --depth=1 --branch develop https://github.com/vector-im/riot-web.git riot-web
  -cd riot-web
  +RIOT_WEB_DIR=riot-web
  +REACT_SDK_DIR=`pwd`
  +
  +git clone --depth=1 --branch develop https://github.com/vector-im/riot-web.git \
  + "$RIOT_WEB_DIR"
  +
  +cd "$RIOT_WEB_DIR"
  +
  mkdir node_modules
  -ln -s ../.. node_modules/matrix-react-sdk
  npm install
  (cd node_modules/matrix-js-sdk && npm install)
  -# https://github.com/webpack/webpack/issues/1472 workaround
  -(cd node_modules/matrix-react-sdk && npm install source-map-loader)
  +rm -r node_modules/matrix-react-sdk
  +ln -s "$REACT_SDK_DIR" node_modules/matrix-react-sdk
  npm run test
  