Do not suggest props that are not compatible with the version of the vcard

[skjnldsv]

On the add new property, we should not allow the addition of properties that are not allowed on the vcard rfc.

There is an issue regarding the allowed data on the ical.js: https://github.com/mozilla-comm/ical.js/issues/363

https://github.com/mozilla-comm/ical.js/blob/d26b19fa5adb4d3d6e03bff6c6e4c0705c12ab11/lib/ical/design.js#L873

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