v0.12.dev8: Store attachments as intact files (#659)

* attachments are saved as intact files

* reform attachments and filepath

* complete implementation of external storage except for `clean`

* refactor external storage

* complete refactoring of external storage for version 0.12
all tests pass

* rename attribute `basename` to `attachment_name` in external table

* add __repr__ to ExternalMapping

* external files are not copied if stage and store are the same

* make external tables require setting the `delete_external_files` argument

* update CHANGELOG

* fix Python 3.4 compatibility

* fix Python 3.4 and 3.5 compatibility

* dropped support for Python 3.4

* minor changes in error messages

* Update to pathlib in test init.

* Update test_blob_migrate to be compatible for WIN10.

* Fix WIN10 compatibility with KeyboardInterrupt and SystemExit exceptions.

* Fix WIN10 filepath to store as posix and fetch as user's platform.

* Fix relpath for Python3.5.

* Fix copytree for Python3.5.

* Fix typo.

* Fix for Python3.5.

* Update coveralls.

* Update coverall env vars.

* add environment variable DJ_SUPPORT_FILEPATH_MANAGEMENT to enable/disable the filepath datatype

* Update CHANGELOG.md

Co-Authored-By: guzman-raphael <38401847+guzman-raphael@users.noreply.github.com>

* Update CHANGELOG.md

Co-Authored-By: guzman-raphael <38401847+guzman-raphael@users.noreply.github.com>

v0.12.dev7: Merge pull request #660 from guzman-raphael/dev

Bump version

v0.12.dev6: Merge pull request #654 from guzman-raphael/dev

Update ahead of pre-release

v0.12.dev5: Merge pull request #642 from guzman-raphael/dev

Update changelog

v0.12.dev4: Merge pull request #609 from guzman-raphael/v_update

Increment version

v0.12.dev: Merge pull request #532 from dimitri-yatsenko/attachments

Attachments and configurable blobs

v0.11.1-doc1: Merge pull request #551 from austin-hilberg/master

Documentation content additions and revisions for M2

Release 0.11.1

Fix ordering of attributes in proj (#483 and #516)
Prohibit direct insert into auto-populated tables (#511)

Release 0.11.0

The main new feature in this release is the full support of projections in dependencies (foreign key) including table definition, cascaded deletes, and auto-populate.

Major Changes:

• Full support of dependencies with renamed attributes using projection syntax (#300, #345, #436, #506, #507)
• Rename internal class and module names to comply with terminology in documentation (#494, #500)
• Full support of secondary indexes (#498, #500)
• ERD no longer shows numbers in nodes corresponding to derived dependencies (#478, #500)
• Full support of unique and nullable dependencies (#254, #301, #493, #495, #500)
• Improve memory management in populate (#461, #486)
• Fix query errors and redundancies (#456, #463, #482)

Release 0.10.1

Merge pull request #474 from dimitri-yatsenko/master

update release info for version 0.10.1