Update to latest dynapath.

This commit addresses two issues:

* dynapath is now org.tcrawley/dynapath, so we should update bultitude
  to prevent multiple copies ending up on the classpath

* 0.2.3 addresses an issue that allowed pomegranate to modify the boot
  classloader, which wreaked havoc. Updating bultitude may prevent a
  transitive dependency from bringing that havoc back.