put guac on the latest stable ADAM release

running off of -SNAPSHOT releases means code can change under us
during development, and also that there are not source jars in
maven.
remove adam snapshot dependent mdtag change
Merge pull request #132 from hammerlab/un-snapshot

put guac on the latest stable ADAM release
new snv caller
adding caller to main list
filtering out deletion alternate base for now
update for ADAM 0.11