Require C++11 compilation

Mike Fleetwood requested to merge mfleetwo/gparted:c++11 into master

This is to enable C++11 compilation of the GParted code, use one of the new features (nullptr) and uprade to Google Test 1.10.0. There are a number of other new C++11 features that could be used but this will do for now.

Edited by Mike Fleetwood

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