Some warnings fixed#50

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jaw wants to merge 3 commits into

lvandeve:masterfrom

Commits on Apr 30, 2016

Fix some vs2015 warnings
jaw
committed

Commits on May 2, 2016

disable warning for vs2015
jaw
committed

Commits on Mar 16, 2017

Merge branch 'master' of https://github.com/lvandeve/lodepng into test
jaw
committed