Updated imagen submodule reference
Updated dataviews submodule reference
Updated nbpublisher submodule reference
Updated reference data submodule reference
Setting time_dependent via the constructor of Model

This allows time_dependent to be True by default while supporting legacy
behavior.
Current GCAL training test now based on topo/tests/gcal_legacy.ty
Introduced training test for time-dependent, class-based GCAL model
Fixed pyflakes warning
Removed all updated GCAL (class-based) models from 'unopt' tests
Updated featuremapper submodule reference
Fixed import for when topo is not available in the namespace
Added verbose option to call method of Model
Simulation now warns when topo.sim.model not called due to dirty state
The runscript command now accepts 'load' and 'verbose' options
Updated reference data submodule reference
Merge branch 'master' of github.com:ioam/topographica into color_improvements