Adding tomee 1.7.0

- Including up and downgrade functionality
- Including tomee juli logger
Updating logic for determining tomcat version

Allows for specifying either tomcat or tomee version, tomee version
always overrides the tomcat version.
Code cleanup
Forgot to add the new jaxb-core artefact
Adding tomcat specific el-api
Merge pull request #2 from sbilo/master

Adding tomee 1.7.0