Add class attribute to form

This makes it easier to target the form for theming because otherwise there is no unique identifier for the form.

Now we have a class for the form and wrapper div which is made up of fp- + a sanitized version of the form name (only alphanumeric and -)

I'm ok with this, though it does preculude having the thing twice on one page; e.g. people might have a sign up form in a sidebar and at the bottom of an article. Would having it as a class name be better? I also wondered whether this should be on the main container div. But meh!

I only needed it for (css) theming, so happy for this to be wherever you think is best :-)

Let me know if you'd like me to update the PR

I'd suggest adding it as a class on the outer div. Don't mind if you want it as a class on the <form> too.

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• e50e2ba2 - Add class attribute to form and wrapper div

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changed title from Add id attribute to form to Add class attribute to form

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@artfulrobot Updated and recompiled to use class on div and form

merged

mentioned in commit 19525c16