Added our first benchmark, fully profilable.

- To get profiling working, I added a PythonPlan class
  for basic profiling of Python functions.
Added our first benchmark, fully profilable.

- To get profiling working, I added a PythonPlan class
  for basic profiling of Python functions.
Added code to convert Python functions to OCL.

- It's almost working, I think
Can now convert Python to OCL!
Got AST conversion test working again
Merge branch 'ast-conversion'

Conflicts:
	nengo_ocl/plan.py
	nengo_ocl/sim_npy.py
	nengo_ocl/sim_ocl.py
Merge remote-tracking branch 'upstream/master'

Conflicts:
	nengo_ocl/plan.py
	nengo_ocl/sim_npy.py
Merge pull request #28 from hunse/master

Added our first fully profilable benchmark.