Update TomEE Version
Update TomEE Version

This changes the downloaded version of the TomEE dependency to 7.0.+ which
should move the buildpack from 1.7.4 to 7.0.1 currently.

cloudfoundry-community/tomee-buildpack,violetagg/tomee-buildpack,violetagg/tomee-buildpack,cloudfoundry-community/tomee-buildpack