fixed errors in MinGW, added compression support in both client and s…#3

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brightening-eyes wants to merge 6 commits intojseward:masterfrom brightening-eyes:master

+74-31

Commits on Apr 25, 2016

Commits on Apr 26, 2016

completely fixed compression with range coder, now it works
brightening-eyes
committed

Commits on Apr 30, 2016

added a feature to use a custom ENetCompressor
brightening-eyes
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Commits on May 1, 2016

reverting changes back for fixing the errors
brightening-eyes
committed