[ADAM-340] Adding the TrackedLayout trait and implementation.

OrderedTrackLayout is an implementation of TrackedLayout, which takes a sequence of Reference-mappable values and lays them out into tracks in a naive, order-dependent way.
Merge pull request #341 from genomebridge/tdanford/tracked-layout

[ADAM-340] Adding the TrackedLayout trait and implementation.
[ADAM-309] Update to bdg-formats 0.2.0

- Some of the files have been renamed as part of the renames in
  bdg-formats
- I cleaned up some of the references in the files, as well as some of
  the IntelliJ complaints in the files