Added "jsonform-readonly" and "jsonform-disabled" to container (#47)
Added "jsonform-readonly" and "jsonform-disabled" to container (#47)

The mechanism is the similar to that used for the "required" property:
if the input field is marked as readonly or disabled, the
corresponding attribute gets added to the input field and its root
container "<div>" is marked with a "jsonform-" class to ease styling.

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