Palindrome products: sync expected test results and input data with problem-specifications.

[BethanyG]

Part of #1762

• Changed function names to largest / smallest in tests, example.py, and exercise stub to conform with canonical-data.json.
• Changed main function function argument names to min, / max in tests, example.py, and exercise stub to conform with canonical-data.json.
• Changed expected data type in tests to list of lists to conform with canoncial-data.json.
• Changed some function and variable names in example.py to better clarify code and remove single letter variable names.
• Removed from __future__ import division from example.py

[cmccandless]

Suggested change

[cmccandless]

min and max are reserved.

Suggested change

	def largest(min, max):
	def largest(min_factor, max_factor):

[cmccandless]

Suggested change

	Notes regarding the implementation of smallest_palindrome and
	Notes regarding the implementation of smallest and

[BethanyG]

Since I needed to alter the tests as well, decided to push additional changes.

• Changed min/max back to min_factor / max_factor in tests, test notes, example code, and exercise stub to avoid using min/max reserved words for argument names.
• Changed reference to smallest_pallendrome to smallest in test notes.

[cmccandless]

Merged; thanks for working on this!