Datadog

* [FEATURE] Roles and Permissions APIs [481][]
* [FEATURE] Add support for Azure, GCP and AWS integrations endpoints [429][]
* [FEATURE] Add support for new `Monitor.can_delete` endpoint [474][]
* [FEATURE] Add support for the `Monitor.validate` endpoint [487][]
* [FEATURE] Add support for `/v1/downtime/cancel/by_scope` [488][]
* [IMPROVEMENT] Dogshell: remove Exception wrapping [477][]

* [BUGFIX] Fix distribution metric submission by sending api/app keys through query params for this endpoint. [480][]
* [FEATURE] Add Synthetics support [433][]

* [BUGFIX] Fix possible issue that could leak file descriptors when reading config [425][]
* [BUGFIX] Fix graph snapshot status endpoint [448][]
* [BUGFIX] Revert `users` resource name to singular `user` as it was not fully supported [450][]
* [BUGFIX] Fix error printing to stderr char by char [449][]
* [BUGFIX] Add `_return_raw_response` to `api` module to prevent import errors before `initialize` is called [461][]
* [BUGFIX] Threadstats: Fix periodic timer error on interpreter shutdown [423][]
* [FEATURE] Add support for SLOs [453][] and [464][]
* [FEATURE] Add ability to send compressed payloads for metrics and distribution. [466][]
* [FEATURE] Add parameter `hostname_from_config` to `initialize` to enable/disable hostname lookup from datadog-agent config to avoid warnings [428][]
* [FEATURE] Dogstatsd: add ability to specify a default sample rate for all submissions [470][] (thanks [dtao][])
* [IMPROVEMENT] Send API credentials through headers instead of URL query parameter [446][]
* [IMPROVEMENT] Clarify docstring for metrics API [463][]
* [IMPROVEMENT] Assert `alert_type` is correct when creating event [467][]
* [IMPROVEMENT] Dogshell: make query and type optional when updating a monitor [447][]

* [BUGFIX] Treat `API_HOST` as URL, not as string [411][]
* [FEATURE] Add `return_raw_response` option to `initialize` to enable adding raw responses to return values [414][]
* [IMPROVEMENT] Add project URLs to package metadata [413][] (thanks [Tenzer][])
* [IMPROVEMENT] Add support for handling a 401 status as an API error [418][]
* [IMPROVEMENT] Allow configuring proxy in `~/.dogrc` for usage with dogshell [415][]
* [IMPROVEMENT] Update `user` resource name to `users` to match new plural endpoints [421][]
* [OTHER] Add deprecation warning to old aws lambda threadstats integration [417][]
* [OTHER] Removed functionality to delete events and comments, as it's no longer supported by API [420][]

* [BUGFIX] Fix encoding issue on install [391][] and [392][] (thanks [Alphadash][] and [ningirsu][])
* [BUGFIX] Dogwrap: Fix dogwrap unicode option parsing on python 3, [395][] (thanks [Matt343][])

* [BUGFIX] Revert [Return Rate Limit Headers][378], [401][]