Move Visible Rows & caption placeholder#39

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Mottie wants to merge 4 commits intoakottr:masterfrom Mottie:master

+25-16

Commits on Jan 5, 2015

Only display visible rows while moving
Mottie
committed

Commits on Jan 6, 2015

Include matched-height caption placeholder in movable columns
Mottie
committed

Commits on Jan 12, 2015

Swap all rows, not just visible ones - oops!
Mottie
committed

Commits on Jan 15, 2015

add zIndex option
Mottie
committed