cleanup; fix bug where layers wouldnt refresh on reset
changed terminology
comment fix
cleaning up DataModel
Fixed sensor bug, removed commented code
Renamed frameRate to timeStep
Fixed indents, modified comments
Merge pull request #34 from bennlich/crs-patch

Sensor bug fix, renamed a couple things
Added a doc for describing the model interface. Not perfect, but maybe helpful?
Merge pull request #35 from bennlich/crs-patch

Added a doc for describing the model interface