Added additional method signatures to all applicable element factory methods as discussed in ProductiveRage/Bridge.React#5
Added additional method signatures to all applicable element factory methods as discussed in ProductiveRage/Bridge.React#5

The only one that it doesn't apply to is TextArea, since that doesn't
take child components (though it does get one new method signature, so
that the properties argument is optional)

ProductiveRage/Bridge.React,ProductiveRage/Bridge.React