Issue #1979: Add generation of JSON for widget specs which is then used to create MD.

[reggied]

No description provided.

[jasongrout]

I extended the program a bit to have an option to generate a json file, and also checked in the current json file. This is so people can read in that json file and do the programmatic checking they want.

@SylvainCorlay - could you look at this, and in particular look at the JSON spec generated, and let us know if it looks good to you?

[SylvainCorlay]

PS: @reggied, FYI you did not use the same email for your commits as the one that is registered for your GitHub account.

In order to be creditted by GitHub for these commits, either we can rebase an use the same email as in https://github.com/django-salesforce/django-salesforce/commit/0d4a4de143853b6326f78796d74e35800e57196b.patch or add this email to the GitHub account.

[SylvainCorlay]

Rebased.

[SylvainCorlay]

Thanks @reggied!

Sorry for taking so long. I am merging the PR.