Removed advanceLayoverState() -- it is never used and therefore
confusing to have.
refactoring the calculation of isAtPotentialLayoverSpot when creating
BlockStateObservation objects.  Functionally idempodent.
Comment clarification, renamed one (currently unused) method.
Some comments, in preparation for first stab at layover-in-motion
First attempt at layovers-in-motion (for layover_during only), only
following a stationary layover.
Merge branch 'master' of github.com:fruminator/onebusaway-nyc into fruminator-master
Revert "Merge branch 'master' of github.com:fruminator/onebusaway-nyc into fruminator-master"

This reverts commit 61525af4e65f2ab1797ab69d40f01471914d6666, reversing
changes made to 811eadbd8ef8dc451389714f398acda252102b10.
Revert "Revert "Merge branch 'master' of github.com:fruminator/onebusaway-nyc into fruminator-master""

This reverts commit 31fd817b403152b345d18c6391903c4dd47d9c48.
A revert of a revert; merging fruminator-master back into master.
I need the isAtPotentialLayoverSpot function.
obanyc-2146 + merge for Fruminator's layover in motion cleanup.  I used
the layover determination library to help solve this issue.
Merge branch 'master' of github.com:/camsys/onebusaway-nyc