#1297: Fixed docs. Thanks to xiwu for pointing out this issue.
added a link to the java DSL being used
pass in the auto-join but don't auto-create an ensemble env vars when creating tomcat as a child process/container
now we properly pass in the join/ensemble env vars we don't need to use the fabric8 specific shell script for starting a tomcat; so can work with any tomcat distro
fixes #844 so we don't add pom.xml artifacts to the bundle list
#1380 added better error message if a mapping cannot be found
#1380 default to testing with a context path; and by default strip off the context path before trying to find a mapping rule