Grails buildpack support

Previously, there were a couple of very specific class names that
triggered auto-reconfiguration functionality.  These class names were
incompatible with Grails even though the auto-reconfiguration
functionality works just fine for Grails.  This change makes those
trigger class names a bit more broad to allow Grails applications to
work.

In addition, small fixes have been made to how symbolic links are
created, and the visual output of the buildpack.

[#53084311]
Merge 53084311-grails-support to master

[#53084311]