Changed copied to get, like model.get

- This simplified some example syntax
Merge pull request #44 from ctn-waterloo/sim_get

Changed sim.copied to sim.get
Updated README.md file

Updated readme file to include nvidia driver version check paragraph.
AST conversion now supports vector inputs.

- I also added support for very basic list comprehensions
Fixed bug with sign function on GPU
AST conversion now supports simplification
Merge pull request #45 from hunse/ast-vectorized

AST conversion now supports vector inputs.
Now uses nengo.builder.Builder

- Also changes due to refactoring in Nengo PR #177
- TestSimulator is now explicitly imported, as not all simulators
  are expected to pass these tests (but these are valid for
  the OpenCL backend, for now)
- Also fixes a lif_rate bug due to recent LIF changes
fixed license in setup.py to match LICENSE.txt
Merge pull request #47 from ctn-waterloo/nengo_builder

Use nengo.builder.Builder
Fixes for changes to Signals

- See Nengo PR#183
Changed length ValueError to assert

- sim_ocl caught the AssertionError but not the
  ValueError, so I figured that's what it should have been.
Fixed issues when simulation has no probes

- run_steps assumed that probes existed
Got nengo_ocl passing all tests, synced with nengo

- Removed transpose handling in setup_views_MultiProdUpdate,
  since no ops have an `xT` attribute anymore.
- Renamed SimDirect to SimPyFunc to accord with Nengo
- Fixed reshaping problem in SimPyFunc