Addresses chetan51/nupic.cerebro2#26. Added camera controls to position camera in various default views. As a part of this, added an equation to calculate a reasonable distance for the camera based on the size of the model. All of this necessitated some
modifications to the display of the dat.GUI elements in order to make room for the extra buttons.
Refactored based on PR feedback.
Merge with master
Remove positionDrawings to simplify code
Merge branch 'jefffohl-issue26c'
Move reshapeUpdated to CellVisualization class