[ADAM-330] Make mismatch and deletes positions accessible
Merge pull request #330 from hammerlab/mdtag-access

Make mismatch and deletes positions accessible
Added the TrackedLayout class.
Added filterByOverlappingRegion to AdamRDDFunctions
Added the VizReads tool to CLI.

VizReads is a tool for interactive or static visualization of aligned reads along the genome.
Ran ./scripts/format-source