Bump the parent to its first release version

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Allow older Java6 compilers to compile SPIM Registration

The reference compiler for Java is still OpenJDK's javac, not Eclipse's
compiler. Therefore we really need to make sure that our code conforms
with the requirements of OpenJDK. This is a real problem because SPIM
Registration, just like mpicbg, exercises rarely executed generic
constructs, and therefore we are prone to fall into traps where the
maintainer has to work quite a bit until code is compiling outside of
Eclipse.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>