Fixes neuecc/UniRx#38 ObservableWWW exception with Unity5#4

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movrajr wants to merge 2 commits intoInvertGames:masterfrom

Commits on Dec 12, 2014

Merge pull request #4 from neuecc/master
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Commits on Apr 2, 2015

Merge pull request #5 from neuecc/master
movrajr
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