Bug 1530206 - Heroku: Re-organise the Procfile
Bug 1530206 - Heroku: Re-organise the Procfile

* Adds documentation
* Renames several of the `Procfile` process types to be clearer.
* Moves pushlog ingestion into `worker_misc`.
* Combines push and job storing into `worker_store_pulse_data`

Before:
- web
- worker_beat
- worker_pushlog
- worker_store_pulse_jobs
- worker_store_pulse_resultsets
- worker_read_pulse_jobs
- worker_read_pulse_pushes
- worker_default
- worker_log_parser

After:
- web
- celery_scheduler
- pulse_listener_pushes
- pulse_listener_jobs
- worker_store_pulse_data
- worker_log_parser
- worker_misc

KWierso/treeherder,KWierso/treeherder,edmorley/treeherder,edmorley/treeherder,KWierso/treeherder,edmorley/treeherder,KWierso/treeherder,edmorley/treeherder