NumberField (Vaadin 8) - Vaadin Add-on Directory

NumberField converted to Vaadin 8

[Original Vaadin 6 version](https://vaadin.com/addon/numberfield) [Vaadin 7 version](https://vaadin.com/directory#!addon/numberfield-vaadin-7) [Vaadin 7 compatibility version for Vaadin 8 projects](https://vaadin.com/directory#!addon/numberfield-vaadin-7-compatibility)

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NumberField (Vaadin 8) version 0.2.0
* Vaadin 8 & Java 8 * Default validation happens in ValueChangeListener because there are no more validators in fields * There is no automated converter because that also doesn't happen within fields anymore, you need to add NumberField.getConverter() to your Binder * Small API tweaks