Exoctk

Fixed

- Date format in hover tool of contam visibility plots
- Logging issue with production server.

Changed

- Removed support for "uniform" (constant) limb-darkening law.
- Removed lmfit from requirements.

Added

- Sweep to update code to match PEP8 standards.
- Extra authors on citation information to match current working DOI.

Fixed

- Phase-constraint bug that didn't change `eccentricity` to `nan` when not found by the target resolver.