message: install ComplexHttpServer regardless of whether riot is already installed
diff: set -e
  RIOT_BRANCH=develop
  -BASE_DIR=$(cd $(dirname $0) && pwd)
  -if [ -d $BASE_DIR/riot-web ]; then
  - echo "riot is already installed"
  - exit
  -fi
  -
  cd $BASE_DIR
  # Install ComplexHttpServer (a drop in replacement for Python's SimpleHttpServer
  # but with support for multiple threads) into a virtualenv.
  @@ -26,6 +20,12 @@ cd $BASE_DIR
  deactivate
  )
  +BASE_DIR=$(cd $(dirname $0) && pwd)
  +if [ -d $BASE_DIR/riot-web ]; then
  + echo "riot is already installed"
  + exit
  +fi
  +
  curl -L https://github.com/vector-im/riot-web/archive/${RIOT_BRANCH}.zip --output riot.zip
  unzip -q riot.zip
  rm riot.zip
  