JSON field now pretty-printed when you edit it in django admin or another form, built with ModelForm.
Field can now save NULL to DB instead of string 'null'.
If field's `null=True` and the model's field is set to None then NULL
is saved to DB instead of 'null'.
Added .idea to .gitignore.
Added indent in value_from_object.
For pretty-printed JSON when using ModelForm.
Merge commit '97f3556c5e3e2a6dd0bdc126633a0a093b19b264' into null_merge
Fixed parent in super call.
Added code from #21.
Merged code from bradjasper#21
Merge branch 'null_merge'
@l0kix2 thanks! good changes, pulled in.