Fixed non-qualified numpy import in topo/analysis/featureresponses.py
Updated submodule references to latest imagen
Restored simplified SheetView implementation till DataViews are ready for use
Merge branch 'master' of https://github.com/ioam/topographica
Updated paramtk submodule reference
Updated paramtk submodule reference
Ignoring *.cpp files generated by Cython
Removed commented code
Added the update_sheet_activity function which updates sheets individually
Forcing update_activity in measure_response to ensure update regardless of topo.sim.time()
final edit before fork