* Add interim grains
* Refactor and add blacklist
* Change PT30M to PT0.5H
* Linting
* Linting
* Add time grain addons to config.py and refactor engine spec logic
* Remove redundant import and clean up config.py
* Fix bad rebase
* Implement changes proposed by @betodealmeida
* Revert removal of name from Grain
* Linting