compatibility for Django version>1.5#22

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GuidoE wants to merge 3 commits intocaffeinehit:masterfrom

Commits on Sep 23, 2014

compatibility for Django version>1.5
GuidoE
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Commits on Aug 10, 2015

handles Django v1.8 deprecation
GuidoE
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Commits on Feb 7, 2016

Update utils.py
GuidoE
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