add new background image and draw it in the game#102

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FelixLaiYF wants to merge 8 commits intomacite:masterfrom

kennytancl101223727:add-background-image

Commits on Mar 27, 2015

Add new cards and update card dimensions in SnapGame accordingly.
jakerenzella
committed

Commits on Mar 28, 2015

fix image size and gaps between cards
macite
committed

Commits on Jul 9, 2015

merge in fixes for Windows
macite
committed

Commits on Aug 13, 2015

Commits on Mar 11, 2021