NumberField (Vaadin 7) - Vaadin Add-on Directory

NumberField converted to Vaadin 7

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

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NumberField (Vaadin 7) version 0.1.0
Quick conversion with minor refactoring.

NumberField (Vaadin 7) version 0.1.3
Quick fixes for some localization problems, added pom.xml

NumberField (Vaadin 7) version 0.1.4
- Use shared state instead of legacy communication. - Upgrade to use Vaadin 7.6.4

NumberField (Vaadin 7) version 0.1.5
Prevent entering letters when SHIFT is pressed (solution by Tamás Ambrits, thank you for the contribution!)

NumberField (Vaadin 7) version 0.1.6
Quick fix for an issue caused by moving to use shared state instead of legacy communication.

NumberField (Vaadin 7) version 0.1.7
NPE fix by Olli Tietäväinen, thanks for the contribution!

NumberField (Vaadin 7) version 0.1.8
Validation fix, thanks to Victor Tarasov for the contribution!