Update Python examples to support Python 2 and 3

[panathea]

I've updated the Python examples to work with both python 2 and 3. This required a few minor changes:

• Using "input" in Python 3, and including an import that renames "raw_input" for Python 2.
• Importing the print function from __future__ which makes print behave like in Python 3.

I also applied some minor PEP8 formatting changes, which includes:

• Removing unnecessary brackets
• Reordering imports
• Changing all strings to single quotes

There were a few other really minor changes along the way. If you have any questions about the code, I'd be happy to explain anything. I tested this with my Sensel Morph on the Mac's built-in python (2.7.10) as well as 3.6.