New genotype and somaticgenotype to store more intermediate statistics

- Added new CalledGenotype and CalledSomaticGenotype (and Kryo serializers) to save more intermediate variant calling information used for filtering

This also makes a distinctions between germline and somatic calls to the filters can be applied appropriately.  Part of breaking down #147 and is dependent on #162 
I hadn't fetched origin, did that, rebased and the first commit was automatically dropped, but now:

! [rejected]        variant-genotype -> variant-genotype (non-fast-forward)
error: failed to push some refs to 'https://github.com/hammerlab/guacamole.git'
hint: Updates were rejected because the tip of your current branch is behind
hint: its remote counterpart. Integrate the remote changes (e.g.
hint: 'git pull ...') before pushing again.
hint: See the 'Note about fast-forwards' in 'git push --help' for details.