* Setup api / reducers / actions for gas.
* Implement gas price saga, fetch from component, and loading states. Blocked on CORS.
* Implement caching mechanism.
* Add tests for gas saga and reducer.
* More testing.
* Indicate that gas price is recommended when fetched from API.
* Hide track while loading.
* Fix tscheck.
* Check gas estimate before assuming its ok.
* Check for correct logical order of gas prices.
* Tscheck fixes.
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