Merged cell borders#271

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mdotterer wants to merge 3 commits intoweshatheleopard:masterfrom

hslogix:merged-cell-borders

Commits on Aug 16, 2017

Apply border changes to all cells in a merged cell for more intuitive border setting when using merged cells
mdotterer
committed

Commits on Aug 17, 2017

Prevent changing column/row border from bleeding over merged cells
mdotterer
committed
Apply border color changes intuitively to merged cells
mdotterer
committed