Panoptes-client

- Fix: Avoid reloading resource after create actions
- Fix: Add buffer to bearer token expiration check
- Remove default export timeout

- New: Add support for non-image media types (requires libmagic)
- New: Allow lazy loading of objects
- New: Add `WorkflowVersion` class and `Workflow.versions` property
- Fix: Don't submit empty JSON by default for GET requests
- Fix: Adding location paths in Python 2
- Fix: Return a list of linked objects instead of a map in Python 3
- Use `SetMemberSubject` for `SubjectSet.subjects` lookup to improve speed
- Set default endpoint to www.zooniverse.org
- Raise TypeError if positional batchable argument is missing
- Convert `Collection.subjects` and `SubjectSet.subjects` to properties

- New: Python 3 compatibility
- Fix: Fix passing sets to batchable methods
- Fix: `AttributeError` in `Workflow.add_subject_sets()`

- New: Add Collection
- New: Allow editing of workflows
- New: Add method to get User's avatar
- New: Add support for iterating over numpy arrays
- New: Add per-Workflow exports
- Fix: setting endpoint in environment variable
- Fix: Stop iterating if there are no objects in the current page

- New: Add Project.collaborators() and ProjectRole
- New: Add admin option
- Fix: Raise PanoptesAPIException instead of StopIteration
- Fix: Make ResultPaginator handle None responses
- Fix: Raise PanoptesAPIException instead of StopIteration in PanoptesObject.where()

- New: Send SubjectSet.remove() requests in batches
- Fix: Raise PanoptesAPIException instead of StopIteration in Project.find()
- Fix: Don't read the image file on every upload attempt