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)
Rather than `rotate` and `rotated`, I propose:
```
def rotate(degrees=None, radians=None, dtype=None)
```
Degrees should be first to allow `rotate(deg)`. I know this infuriates mathematicians, but it is standard across most graphics packages.