Fix dependency on window in an enviroment, where window is not available.#76

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johandavidsen wants to merge 3 commits intojoewalnes:masterfrom johandavidsen:master

Commits on Oct 17, 2016

This should fix any issues arising from testing/using this library, where there the window is not available. Fixes #71
johandavidsen
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Commits on Oct 18, 2016