Updating CHANGES.md for the 0.12.0 release
[maven-release-plugin] prepare release adam-parent-0.12.0
[maven-release-plugin] prepare for next development iteration
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.