Bar: fix issue #372 - bar widths with nonnumeric sizes#1

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seibs wants to merge 12 commits intomasterfrom

Commits on May 11, 2016

Commits on May 12, 2016

painfully work through more IE bugs with snapshot
timelyportfolio
committed
reject with error in `svgtoimg` in IE if not `format:'svg'`
timelyportfolio
committed

Commits on May 14, 2016

fix promise check in toimage_test
timelyportfolio
committed

Commits on May 17, 2016

Bar: fix issue #372 - bar widths with nonnumeric sizes
seibs
committed