Update setup.py to keep statements in a separate function for extensibility.

[jgreenemi]

Move lambda setup statements to their own function. lambda_creation would be a great name though it's already in use, so consider if a refactor is necessary. Also rename internal functions per PEP8. All this would bring the tool to being closer to pipeline integration, as in its current state one can't (easily) import it into an existing tool like a dependency.