Vladiate

- `UniqueValidator` checks if `unique_with` fields are actually in the row (https://github.com/di/vladiate/issues/3)
- Output is suppressed for validators with 100+ failures (https://github.com/di/vladiate/issues/4)
- Vlads can now be created programmatically and do not need to be run from the command line (https://github.com/di/vladiate/issues/5)
- Typos/small fixes

- Add `RegexValidator`

- Add `S3File` input type
- Improved docs

- Fixed issue with markdown readme
- Now pip installable
- Updated README

Initial version.