Updated run_dev instructions.
Updated run_dev instructions.

Also, removed the deprecated --package_manager option in install_development.sh

tgracchus/spinnaker,Roshan2017/spinnaker,skim1420/spinnaker,skim1420/spinnaker,ewiseblatt/spinnaker,skim1420/spinnaker,ewiseblatt/spinnaker,tgracchus/spinnaker,Roshan2017/spinnaker,Roshan2017/spinnaker,duftler/spinnaker,spinnaker/spinnaker,imosquera/spinnaker,duftler/spinnaker,spinnaker/spinnaker,duftler/spinnaker,jtk54/spinnaker,tgracchus/spinnaker,stitchfix/spinnaker,skim1420/spinnaker,stitchfix/spinnaker,ewiseblatt/spinnaker,imosquera/spinnaker,imosquera/spinnaker,spinnaker/spinnaker,jtk54/spinnaker,jtk54/spinnaker,stitchfix/spinnaker,ewiseblatt/spinnaker,duftler/spinnaker,spinnaker/spinnaker