Fixed libusb problem on Linux, modified makefile slightly to work on linux#6

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Learath wants to merge 4 commits intocharmedlabs:masterfrom Learath:master

+595

Commits on Apr 1, 2014

Fix Linux USB bug and compile issues on Centos.
nick
committed
Actually catch all the files this time.
nick
committed
Missed a missing header. (stdlib.h)
nick
committed

Commits on Oct 31, 2014

Merge remote branch 'upstream/master'
Learath
committed