Fixed many bugs

Added NzOpenGL::GetEntry
Activated preprocessor error if not compiling with a C++11 compliant
compiler
Cube can now be constructed with a Rect
Desactived utility option "threaded window" (bugged)
Epured Image interface (No more UpdateFace, use Update with z = the face
you are targetting)
Fixed compilation errors (Thanks to RafBill)
Fixed predefined colors not exported
Fixed uplading pixels not aligned by 4 bytes
Fixed Thumbs.db files not ignored by git
NzImage now supports Filling and Flipping (Horizontally and vertically)
NzImage::Get(Const)Pixels now support pixel location
NzVector(2/3) can now return floatting distance/length with all types
NzVector(2/3/4) can now be constructed by a vector of smaller dimension
Premake now set "-std=c++11" build option for GCC
Renamed NzImage::(Get/Set)Pixel to (Get/Set)PixelColor
Updated new([])/delete([]) in the leaks tracker to the new C++11
signatures

include/Nazara/Math/Quaternion.inl

@@ -217,15 +217,15 @@ NzQuaternion<T> NzQuaternion<T>::Slerp(const NzQuaternion& quatA, const NzQuater
         k1 = std::sin(interp * omega) * sinOmega;
     }
 
-    /* interpolate and return new quaternion */
     NzQuaternion result(k0 * quatA.w, k0 * quatA.x, k0 * quatA.y, k0 * quatA.z);
-
     return result += q;
 }
 
 template<typename T>
 NzEulerAngles<T> NzQuaternion<T>::ToEulerAngles() const
 {
+	Normalize();
+
 	T test = x*y + z*w;
 	if (test > 0.499)
 		// singularity at north pole