Updated example scripts.

Updated network diagram for 2drepresentation.py, singleneuron.py, twoneurons.py (removed dimensionality of input)

Fixed type in combining.py

Updated example descriptions for controlledintegrator.py, controlledintegrator2.py, controlledoscillator.py, integrator.py, oscillator.py

Removed decimal for noise parameter in manyneurons.py

Added network diagram and description for multiplication.py, squaring.py
Merge branch 'nengo_examples' of https://github.com/ctn-waterloo/nengo_sprint into nengo_examples