Move to bdg-formats

Deletes the adam-format module, and moves the project to build off of the bdg-formats project.
I also don't like bdg_formats in the package name very much.

I thought perhaps I'd look elsewhere for guidance, and e.g. ga4gh calls its project schemas, then uses ga4gh-format as its artifactId, and just org.ga4gh for the package name.  So not much help there.  :)

What about org.bdgenomics.avro for the package name and bgd-formats or bgd-schemas for the artifactId and project name?