Added first Web App skeleton. Updated README.

images/webapp/code/rosetta/common.py

images/webapp/code/rosetta/settings.py

images/webapp/code/rosetta/urls.py

images/webapp/code/rosetta/wsgi.py

images/webapp/db_conf-dev.sh

images/webapp/prestartup_webapp.sh

images/webapp/requirements.txt

images/webapp/run_webapp.sh

images/webapp/supervisord_webapp.conf

rosetta/build

rosetta/setup

run_webapp_unit_tests.sh

view_webapp_server_log.sh

view_webapp_startup_log.sh