NEURON and NEST versions of Izhikevich model are now consistent, with injected currents in nA. Closes #257
Fixes and adds a test for #321, although there are still some cases that will fail.
Fix to initialization of the "u" variable in the Izhikevich model, NEURON backend.
Added two new example files (cf #245)
Deleted some of the more trivial, repetitive example files (cf #245)
Merged the several variants of the VAbenchmarks example into a single script.
Completely rewritten `simple_STDP.py` example script, together with some extensions to the `utility.plotting` module
Fixed receptor type mismatch in native cell types
Tests for issue #309
Previous commit broke the tests for Python 3.2
Merge pull request #325 from obreitwi/nest_fixes

[Nest] Fixed receptor type mismatch in native cell types
Merge remote-tracking branch 'upstream/master'