Version 2.0

• CHUNKED_UPLOAD_ABSTRACT_MODEL settings variable removed
• CHUNKED_UPLOAD_MIMETYPE settings variable removed in favour of CHUNKED_UPLOAD_CONTENT_TYPE
• Support for new Django versions
• Added new settings variables,
  1. CHUNKED_UPLOAD_MODEL_USER_FIELD_NULL
  2. CHUNKED_UPLOAD_MODEL_USER_FIELD_BLANK