NDVIViewer example - deprecation warning for getPreventDefault()

[strikerM]

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Description

When run the following warning appears in the console: Use of getPreventDefault() is deprecated. Use defaultPrevented instead. jquery1.10.2.js:5375:28

Steps to Reproduce

1. Open the NDVIViewer example

Operating System and Version

macOS High Sierra 10.13.1 / Firefox 57.0 (64-bit)

[claudiaifrim]

Confirmed for Linux Mint 18.2 Cinnamon, Firefox 57.0

[pdavidc]

Consider refactoring NDVIViewer as an app as well.

[pdavidc]

Relates to #328