Refactored util/transforms.py translate, scale and rotate to just return

Refactored translate, scale and return to just return a matrix to be multiplied instead of the matrix multiplication being done in the method

Adapted scenen linear transforms as appropriate

Adapted examples as appropriate (except for ipython notebooks, cannot test those)
Sure, degrees are standard in graphics packages --- but radians are standard with scientists/mathematicians/all other packages including Python math. So the question is who the majority are vispys' users: those already familiar with other graphics packages that do it this way, or scientists/mathematicians/ etc... Also, bear in mind that those who are familiar with graphics packages are probably also familiar that 'the majority of the scientific/programming world' uses radians.

So, I think we all agree that we need a way to support both degrees and radians. Therefore,
I provided 'rotated' with the 'd' suffix borrowed from Matlab/Octave/... sind functions. Now the question is which should be the 'default'

As an alternative, forcing an explicit choice, we could have rotated and rotater (or rotatedeg and rotaterad for that matter)