Fix broken examples on IE11

[DiegoCardoso]

IE11 doesn't calculate flex-basis well if element has margin, padding or border, even if it has box-sizing: border-box. In order to prevent it to break, one can add a wrapper, so the flex-basis will work.

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This change is 

[alvarezguille]

integration-tests/src/main/java/com/vaadin/addon/board/examples/ImageCollage.java, line 98 at r1 (raw file):

CssLayout container = new CssLayout();

wasn't this container added as a wrapper initially?

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Comments from Reviewable

[DiegoCardoso]

Review status: 0 of 3 files reviewed at latest revision, 1 unresolved discussion.

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integration-tests/src/main/java/com/vaadin/addon/board/examples/ImageCollage.java, line 98 at r1 (raw file):

Previously, alvarezguille (Guille) wrote…

> CssLayout container = new CssLayout(); wasn't this container added as a wrapper initially?

Yes and no. Initially the container was to receive the styles (border, background, padding etc) and the second one to workaround the IE11 issue. But now I moved the styles to the image itself and made the initial container the only one needed.

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Comments from Reviewable

[alvarezguille]

Reviewed 1 of 3 files at r1, 1 of 2 files at r2, 1 of 1 files at r3. Review status: all files reviewed at latest revision, all discussions resolved.

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Comments from Reviewable