Twilio

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- Remove support for Python 2.6.
- Add `locality` field to `AvailablePhoneNumbers`.
- Add `origin` field to `IncomingPhoneNumbers`.
- Add `in_locality` parameter to `AvailablePhoneNumbers`.
- Add `origin` parameter to `IncomingPhoneNumbers`.
- Add new sync categories to `UsageRecords`.
- Support unicode in `validation_client`.
- Add `muted` parameter to `<Conference>` Twiml.

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- Rename RoomList to RoomRecordingsList.

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- Add video domain.
- Update usage record categories.
- Add `get_page` method for reentrant paging.

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- Allow *kwargs in TwiML Gather

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- Add Task verb to VoiceResponse
- Add Echo verb to VoiceResponse
- Add Sim verb to VoiceResponse

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- Add v2 of chat.twilio.com.
- Add `recording_channels` parameter to Participant create and update.
- Add `recording_status_callback` parameter to Participant create and update.
- Add `recording_status_callback_method` parameter to Participant create and update.
- Add `sip_auth_username` parameter to Participant create and update.
- Add `region` parameter to Participant create and update.
- Add `conference_recording_status_callback` parameter to Participant create and update.
- Add `conference_recording_status_callback_method` parameter to Participant create and update.
- Add `validity_period` parameter to Messages.