Added section to show how to get IP address and view running python app if the user is using boot2docker on OSX
Docker-DCO-1.1-Signed-off-by: Richard Harvey <richard@squarecows.com> (github: richarvey)
Docker-DCO-1.1-Signed-off-by: Richard Harvey <richard@squarecows.com> (github: SvenDowideit)