Waldur-core

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- Preserve and restore tags for OpenStack backups.
- Support for provisioning of Zabbix-based monitoring-as-a-Service solutions.

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- Enhance collaborators permission logic.
- Implemented threshold-based alerts for price estimates and quotas.
- Prevent resource provisioning if total estimated cost of resource and project is over limit.

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- Extended events filter to support filtering by user and time frame.
- Enable filtering resource by category (vms, apps, private_clouds).
- Support permission, filters and metadata for OpenStack tenants.
- Added events hook to send them as push notification messages.
- Enable staff to define mandatory notifications.
- Emit resource state events for all resource models.
- Fix events filtering if resource URL is specified as scope.
- Fix ordering for /resources endpoint.
- Implement pull operation for OpenStack tenant.
- Provide filtering by required tags for resources and template groups endpoints.
- Created event type for project name update.
- Fix OpenStack license stats endpoint.
- Paginate results for customer users endpoint.
- Enable OpenStack tenant autocreation for service project links.
- Define default quotas for service project links.
- Add possibility to filter certain fields for projects/ and customers/ endpoints.

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- Added Resource import signal.
- Fixed quota update bug on cascade deletion.

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- Closed alerts are now cleaned up after a configured period (1 week by default).
- Moved documentation from RST files to docstrings.
- Added developer's section about API documentation.
- Bugfix: removed Django19 warnings.

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- Migrated to Django 1.8.
- Make quota usage readonly in /admin.
- Changed assing_floating_ip signature for OpenStack instances.
- Allow requesting specific REST fields to be rendered in a list.
- Added OpenStack Tenant resource and related operations.
- Documentation improvements.
- Removed state from the service project links.
- Bugfixes.