Release 0.6

[Neah-Ko]

• New feature: uploading large files as chunks
• Improvement on validation/parsing/insertion
  • Tracking of fields that will be populated at insertion time during statement building phase
  • Relationships now get populated on both ends at insertion phase
  • Ultimately allows for better tracking and error handling
  • ... as well as using a loose schema validation policy where integrity is checked by the statement builder
    • Removing the need to write @pre_load functions on marshmallow schemas.
• Docs + unit tests + refactor