Baobao legend positioning#339

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cpsievert wants to merge 10 commits intomasterfrom

baobao-legend_positioning

Commits on May 15, 2015

fixed problem with equal axes
13bzhang
committed

Commits on May 16, 2015

add testthat test for my new features
13bzhang
committed

Commits on May 19, 2015

Commits on May 22, 2015

Commits on May 29, 2015

Commits on May 30, 2015

test expect_equal with tolerance
13bzhang
committed