Add custom loads and dumps settings

[massover]

This allows me to customize the loads and dumps via settings to use dill instead of the default pickle. If no setting exists, defaults to pickle.loads and pickle.dumps

eg.

# settings.py
PICKLEFIELD_DUMPS = 'dill.dumps'
PICKLEFIELD_LOADS = 'dill.loads'

[coveralls]

Coverage increased (+0.1%) to 99.145% when pulling a075744 on massover:add-loads-and-dumps-settings into c6e018e on gintas:master.

[massover]

@jayvdb

Collecting https://github.com/django/django/archive/master.tar.gz
  ERROR: HTTP error 404 while getting https://github.com/django/django/archive/master.tar.gz
  ERROR: Could not install requirement https://github.com/django/django/archive/master.tar.gz because of error 404 Client Error: Not Found for url: https://codeload.github.com/django/django/tar.gz/master
ERROR: Could not install requirement https://github.com/django/django/archive/master.tar.gz because of HTTP error 404 Client Error: Not Found for url: https://codeload.github.com/django/django/tar.gz/master for URL https://github.com/django/django/archive/master.tar.gz

This is the error from the build. Is it expected? If not can we re-run ci to get it merged?

[jayvdb]

could be https://github.com/django/django/ now uses 'main' branch ?

[massover]

could be https://github.com/django/django/ now uses 'main' branch ?

That seems like it!

[massover]

@jayvdb

Since June 15th, 2021, the building on travis-ci.org is ceased. Please use travis-ci.com from now on.

I have updated the tox.ini file but I think that CI is no longer configured to run.

[jayvdb]

ping @gintas

[charettes]

Closing as the PR has conflict and that in order to support this feature we'd likely want to encode the prefix to the loader / dumper in the payload as well to allow for migration.

Given this projects has pickle on its tin I'm also not sure configurable loader and dumpers are warranted as this is not meant to be a generic serde storage layer.