trifacta/vega — pull request #81 by malecki (2013-06-25 03:32:12+00:00)
Title: enter property set for axis group element

Although axes do not have all the regular mark property sets, the marks that comprise them do. Left out is the group element itself, leading to a potential bug if it has a transition, where its interpolated `translate` result is `{}, {}` instead of numeric values. I also updated the barley example to use enter instead of update sets.