Create Java versions of Board examples

[DiegoCardoso]

Examples for:

• Row Types
• Image Collage
• Sales Dashboard

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This change is 

[rogozinds]

Reviewed 34 of 35 files at r1. Review status: 34 of 35 files reviewed at latest revision, 2 unresolved discussions.

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integration-tests/src/main/resources/com/vaadin/addon/board/examples/.DS_Store, line 0 at r1 (raw file): I guess, this is added by mistake?

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integration-tests/src/main/resources/com/vaadin/addon/board/examples/image-collage/.DS_Store, line 0 at r1 (raw file): Remove this

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Comments from Reviewable

[rogozinds]

Reviewed 1 of 35 files at r1. Review status: all files reviewed at latest revision, 2 unresolved discussions.

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Comments from Reviewable

[DiegoCardoso]

Review status: all files reviewed at latest revision, 2 unresolved discussions.

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integration-tests/src/main/resources/com/vaadin/addon/board/examples/.DS_Store, line at r1 (raw file):

Previously, rogozinds (rogozinds) wrote…

I guess, this is added by mistake?

Done.

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integration-tests/src/main/resources/com/vaadin/addon/board/examples/image-collage/.DS_Store, line at r1 (raw file):

Previously, rogozinds (rogozinds) wrote…

Remove this

Done.

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Comments from Reviewable

[rogozinds]

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Reviewed 2 of 2 files at r2. Review status: all files reviewed at latest revision, 2 unresolved discussions.

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Comments from Reviewable