- Refactor each device's configuration loading. The global section will be
  loaded then the section for the app will overrite any sections.
- Defines ambiguous settings that cannot be defined globally. skip these
  settings and emit a warning if they are
- update eventmq.conf-dist to include comments and more of the settings that can
  be defined.
- Refactor some option names.
  * Job Manager: `WORKER_ADDR` is now `CONNECT_ADDR` in the `[jobmanager]`
    section
  * Job Manager: `WORKER_ADDR_DEFAULT` is now `CONNECT_ADDR_DEFAULT` in the
    `[jobmanager]` section
  * Job Manager: `WORKER_ADDR_FAILOVER` is now `CONNECT_ADDR_FAILOVER` in
    the `[jobmanager]` section
  * Publisher: `PUBLISHER_FRONTEND_ADDR` is not `FRONTEND_LISTEN_ADDR` in
    the `[publisher]` section
  * Publisher: `PUBLISHER_BACKEND_ADDR` is not `BACKEND_LISTEN_ADDR` in the
    `[publisher]` section
  * Router: `FRONTEND_ADDR` is now `FRONTEND_LISTEN_ADDR` in the
    `[router]` section
  * Router: `BACKEND_ADDR` is now `BACKEND_LISTEN_ADDR` in the `[router]`
    section
  * Scheduler: `SCHEDULER_ADDR` is now `CONNECT_ADDR` in the `[scheduler]`
    section
  * `RQ_HOST` is now `REDIS_HOST`
  * `RQ_PORT` is now `REDIS_PORT`
  * `RQ_DB` is now `REDIS_DB`
  * `RQ_PASSWORD` is now `REDIS_PASSWORD`
  * `ADMINISTRATIVE_ADDR` is now `ADMINISTRATIVE_LISTEN_ADDR` in each
    respective section

See also: #20

- Split large test into smaller tests
- Add test for invalid json
- Add test for non-nested json array
- Add context manager for mocking the config file.

Related: #20, TEEM-2275 #comment refactored settings.py tests

- This refactors the `self.incoming` and `self.outgoing` sockets to
  `self.frontend` (client facing) and `self.backend` (manager facing). This
  change should make the purpose of these ports more clear for new people
  working in the code.

Resolves: #16

- The GPL header was missing from emq-router and emq-scheduler.
- Reorder the imports in emq-jobmanager to follow the standard.

- Rename the emq-pubsub entry point script to emq-publisher to follow the naming
  standard.

0.3

Add schedule and unschedule helper functions (emq 0.3.1)