Cronq

-------------------

- Docs: reference only RABBITMQ_URL. [Jose Diaz-Gonzalez]

- Feat: allow setting DATABASE_URL env var. [Jose Diaz-Gonzalez]

- CRONQ_MYSQL is pretty cronq-specific, and using DATABASE_URL makes this much easier to deploy to a cloud environment
- force pymysql adapter if none is set instead of default to mysqldb
- only document DATABASE_URL usage

-------------------

- Feat: add .env to dockerignore. [Jose Diaz-Gonzalez]

- Feat: add a Dockerfile for building and running cronq within docker.
[Jose Diaz-Gonzalez]

-------------------

Fix
~~~

- Ensure we can import things from the validator class. [Jose Diaz-
Gonzalez]

Other
~~~~~

- Feat: add more docs to readme regarding configuration validation.
[Jose Diaz-Gonzalez]

-------------------

- Feat: add cronq-validator console script to allow validation of cronq
config via cli. [Jose Diaz-Gonzalez]

-------------------

Fix
~~~

- Ensure we properly convert all entries when there is no first or last
chunk. [Jose Diaz-Gonzalez]

Other
~~~~~

- Chore: remove `/api/jobs/JOB_ID/runs` endpoint. [Jose Diaz-Gonzalez]

This is now included in the `/api/jobs/JOB_ID` endpoint


- Feat: include runs in json api output. [Jose Diaz-Gonzalez]

-------------------

- Feat: add the ability to filter by category.name. [Jose Diaz-Gonzalez]

- Refactor: replace category_id filter with category.id. [Jose Diaz-
Gonzalez]