Fixes issue #65: Allow overriding jsoneditor and ace editor options for individual fields

[GregKaleka]

Fixes #65

This PR allows overriding either the default or project-level django_jsoneditor_init and/or django_jsoneditor_ace_options on a per-field basis.

[nnseva]

Hello @GregKaleka,

I've made changes described in your version of README and got the following error:

  File "/disk0/home/seva/swat/sgerp/jsoneditor/forms.py", line 50, in __init__
    super().__init__(*args, **kwargs)
TypeError: __init__() got an unexpected keyword argument 'init_options'

(django v.2.2.5)

You need to modify the __init__() options and probably the render method of the JSONEditor to pass init_options and ace_options to the widget attributes in the rendered HTML. Notice that the attributes might be empty, so you need to ensure the proper value is passed before the JSON.parse() call in the Javascript code.

[GregKaleka]

@nnseva sorry about that! Looks like I neglected to check in the forms.py changes. I installed this version into a project locally and it is working both with and without those arguments passed in.