Blinkpy

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- Add time check on recorded videos before determining motion
- Fix motion detection variable suck to ``True``
- Add ability to load credentials from a json file
- Only allow ``motion_detected`` variable to trigger if system was armed
- Log response message from server if not attempting a re-authorization

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- Update dependencies
- Dockerize (`3ch01c 198 <https://github.com/fronzbot/blinkpy/pull/198>`__)

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- Fix timeout problems blocking blinkpy startup
- Updated login urls using ``rest-region`` subdomain
- Removed deprecated thumbanil recovery from homescreen

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**Breaking Changes:**

- ``BlinkCamera.battery`` no longer reports a percentage, instead it returns a string representing the state of the battery.
- Previous logic for calculating percentage was incorrect
- raw battery voltage can be accessed via ``BlinkCamera.battery_voltage``

**Bug Fixes:**

- Updated video endpoint (fixes broken motion detection)
- Removed throttling from critical api methods which prevented proper operation of multi-sync unit setups
- Slugify downloaded video names to allow for OS interoperability
- Added one minute offset (``Blink.motion_interval``) when checking for recent motion to allow time for events to propagate to server prior to refresh call.

**Everything else:**

- Changed all urls to use ``rest-region`` rather than ``rest.region``. Ability to revert to old method is enabled by instantiating ``Blink()`` with the ``legacy_subdomain`` variable set to ``True``.
- Added debug mode to ``blinkpy.download_videos`` routine to simply print the videos prepped for download, rather than actually saving them.
- Use UTC for time conversions, rather than local timezone

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- Remove throttle decorator from network status request

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**Breaking change:**
Wifi status reported in dBm again, instead of bars (which is great). Also, the old ``get_camera_info`` method has changed and requires a ``camera_id`` parameter.

- Adds throttle decorator
- Decorate following functions with 4s throttle (call method with ``force=True`` to override):
- request_network_status
- request_syncmodule
- request_system_arm
- request_system_disarm
- request_sync_events
- request_new_image
- request_new_video
- request_video_count
- request_cameras
- request_camera_info
- request_camera_sensors
- request_motion_detection_enable
- request_motion_detection_disable
- Use the updated homescreen api endpoint to retrieve camera information. The old method to retrieve all cameras at once seems to not exist, and this was the only solution I could figure out and confirm to work.
- Adds throttle decorator to refresh function to prevent too many frequent calls with ``force_cache`` flag set to ``True``. This additional throttle can be overridden with the ``force=True`` argument passed to the refresh function.
- Add ability to cycle through login api endpoints to anticipate future endpoint deprecation