Merge pull request #71 from elliot42/master

Add `pep8` linter to CircleCI tests
Add a few AWS utility functions
Add fns to create and update CloudFormation stacks
Conform ' vs. " strings to Python conventions
Fix things from code review
Consolidate create/update branching to 1 fn
Use better parameter name in aws
Merge pull request #65 from kyptin/cloudformation

Add CloudFormation utility functions
Bump minor version number