Urbanairship

- Fixes an issue where SegmentsList URL was not being built properly.

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- Added support for Experiments (a/b testing)
- Added support for Airship's European Union Cloud Site based projects
- Added ability to pass a channel_id parameter to start channel listing at a given channel_id
- Modified the documentation for Pipeline objects to reflect proper parameters

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- Added Create and Send support for SMS, Email and Open Channels
- Added support for scheduled Create and Send
- Added support for Create and Send to inline templates
- Deprecated device type 'all'. This type will be removed in version 6.0.0
- Removed support for python 3.4.x
- Added support for python 3.7.x

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- Updated Pipeline's timing object for delay to handle seconds

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- Added support for a scheduled push to a personalization template

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- NOTE: This is in support of a breaking change to the email registration API.
Version 5.0.0 will not be able to register email channel ids.
Please upgrade.
- Added new commercial and transactional opt-in and opt-out date fields for
registration.
- Removed opt_in_level field for email registration.

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