Make buildscript pointer release agnostic

[adamantivm]

all So that we don't need to change the build scripts of all projects with each release.

Citing the wise @stonier:

This is probably something that could almost be made constant and ease the release process. Damon was looking into it at some point. However probably not high priority with this (last) release. Couldn't do immediately as it points to shifting changes in the rosjava bootstrap libraries.