phetsims/joist#157 changes requested for credits in About dialog
phetsims/joist#157 fix EBM's name
make PlanetPath more efficient
Merge branch 'master' of github.com:phetsims/gravity-and-orbits
Revert "make PlanetPath more efficient"

This reverts commit 1ea7198dd1bf8d040c4b0f45607cbbfb627dc2fe.
Merge branch 'master' into canvas