django object level permissions support

[dirkmoors]

This PR will add support for the object level permission "view_".

This is very useful when integrating this library in a project that uses e.g. Django Guardian to handle the permissions: https://django-guardian.readthedocs.io/en/stable/userguide/assign.html#prepare-permissions

[coveralls]

Coverage increased (+0.1%) to 66.723% when pulling e8c392a on dirkmoors:feature/django-guardian-support into bfb0ccc on llazzaro:develop.

[coveralls]

Coverage increased (+0.1%) to 66.89% when pulling 4e355aa on dirkmoors:feature/django-guardian-support into 4d45a0c on llazzaro:develop.

[coveralls]

Coverage increased (+0.1%) to 67.354% when pulling 089226f on dirkmoors:feature/django-guardian-support into edcf2c0 on llazzaro:develop.

[coveralls]

Coverage increased (+0.1%) to 67.354% when pulling 089226f on dirkmoors:feature/django-guardian-support into edcf2c0 on llazzaro:develop.

[coveralls]

Coverage increased (+0.1%) to 67.354% when pulling 089226f on dirkmoors:feature/django-guardian-support into edcf2c0 on llazzaro:develop.

[coveralls]

Coverage increased (+0.1%) to 67.446% when pulling f0c04a8 on dirkmoors:feature/django-guardian-support into 0c4bda3 on llazzaro:develop.

[coveralls]

Coverage increased (+0.1%) to 67.446% when pulling f0c04a8 on dirkmoors:feature/django-guardian-support into 0c4bda3 on llazzaro:develop.

[llazzaro]

@dirkmoors I will like to merge this. I will do it for next release if possible. I will rename migration since the 0003 is already in use. thanks

[jdufresne]

Looks good to me. Would it be reasonable to add test with integrated Guardian support to avoid this being refactored away?

Needs to be rebased.

[jdufresne]

Can you remove this line? It looks unrelated to the PR of adding object level permissions.