Parliament

Updates IAM definition

- Bumps up size of lru_cache for a large speed improvement
- Adds more global variables
- Fixes unit tests

- Updates IAM definition
- Updates requirements.txt
- Uses pytest now for unit tests as nose is deprecated
- Minor bug fix from https://github.com/duo-labs/parliament/pull/211
- Minor feature to allow exceptions to be swallowed

Undo attempted bug fix

Bug fix

- Updates IAM data
- Adds community auditor SINGLE_VALUE_CONDITION_TOO_PERMISSIVE for this confusing aspect of IAM described [here](https://docs.aws.amazon.com/IAM/latest/UserGuide/reference_policies_single-vs-multi-valued-condition-keys.html) thanks to patrobinson
- Adds RESOURCE_EFFECTIVELY_STAR for when the resource contains more than `*` but is still effectively `*` thanks to raghavkaul
- Bug fix: --directory option works again thanks to frek818