make the rangy.shim(iframeWin) works#340

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shuizhongyueming wants to merge 2 commits intotimdown:masterfrom

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Commits on Sep 2, 2015

make the shimed createRange can get a real doc not null
shuizhongyueming
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make the shimed getSelection can get a real win, not null
shuizhongyueming
committed