Prepares branch for a new release (v0.10)

[shinchris]

• Added a way to handle non-xml errors (Quick Fix for NonXMLErrorException #515)
• Added Webhooks endpoints for create, delete, get, list, and test (Add webhooks #523, Webhooks fixes #532)
• Added delete method in the tasks endpoint (Added Tasks Delete method & tests #524)
• Added description attribute to WorkbookItem (Adds description as a read-only attribute of WorkbookItem #533)
• Added support for materializeViews as schedule and task types (Add support for materializeViews as schedule and task type #542)
• Added warnings to schedules (Receiving warnings in schedule creation #550, Add warnings when adding workbook to schedule #551)
• Added ability to update parent_id attribute of projects (Added a functionality to move an existing project (change it's parent_id) by update method #560, Fixed moving projects too the root #567)
• Improved filename behavior for download endpoints (Fix filename behavior and refactor #517)
• Improved logging (Close missing brackets in log texts #508)
• Fixed runtime error in permissions endpoint (Runtime error in permissions_endpoint #513)
• Fixed move_workbook_sites sample (Fixes move_workbook_sites sample to work properly #503)
• Fixed project permissions endpoints (Project permissions fixes and tests #527)
• Fixed login.py sample to accept site name (Add site-name #549)