[ADAM-311] Adding several simple normalizations.
Merge pull request #311 from fnothaft/simple-normalizations

Adding several simple normalizations.
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