Regularize least-squares -> better decoders
old_api handles seed more like nengo_theano
Steps toward running the matrix_mul old_api test
Lots more changes trying to connect ensembles
Progress on matrix_mul, connection and probes
Added name attribute to Signals (for debugging)
... more name stuff
old_api: removed unused cache call
old_api: refactored make_probe, fixed test
hacking on old_api tests
old_api passing test_prod
fix shapes in test_simulator.py
old_api: fixed bug in connect
unit test env flag for showing plots
Old api: some correctness testing in matrix_mul

Fixed one bug in connect, but still the decoded origins on population C
are wrong.
new test of old_api vector decoding
old_api matrix_mul test passes
removed debug print