made a new running the examples page, and added a link to the top of each example to the page to show people how to run them.
added headers to examples linking back to running the examples page
Extend the documentation covering the web app example

Make it clear how to access the web app running inside of the container
from the host.
Merge pull request #356 from flavio/improve_python_web_app_example

Extend the documentation covering the web app example
Merge pull request #347 from kencochrane/303_docs_fix

improved the example docs to help #303