Barry Low

[Box] Box attributes for Flexbox and Grid

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Addition of non-prefixed grid `gap` was added in CSS package in #596, however wasn't added to Grid package. This PR finishes that addition.

1.3 beta 8: Astronomy - Error: The "collection" property has to be an instance of...

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When I run the kickstarter in 1.3 beta 8: I get Error: The "collection" property has to be an instance of the "Mongo.Collection" in the "_color" class If I pull...

Extend FlexBox/Grid rules

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**Is your feature request related to a problem? Please describe.** I created a PR (#1157) for adding `gap` to the Grid package. However, I'm also seeing other attributes that I...