Merge branch 'rangeiter-msvc' into 'master'

enable ```__cplusplus>=201103``` guarded code on recent MSVC.

See merge request !19

src/OpenVolumeMesh/Core/Iterators.hh

@@ -131,7 +131,7 @@ private:
 };
 
 
-#if __cplusplus >= 201103L
+#if __cplusplus >= 201103L || _MSC_VER >= 1800 // an older MSVC version might be sufficient, didn't test
 
 #include <type_traits>
 

src/Unittests/unittests_iterators.cc

@@ -53,7 +53,7 @@ TEST_F(TetrahedralMeshBase, VertexVertexIteratorTest) {
 
     }
 
-#if __cplusplus >= 201103L // C++11
+#if __cplusplus >= 201103L || _MSC_VER >= 1800 // C++11
     {
 
       std::set<VertexHandle> onering;
@@ -110,7 +110,7 @@ TEST_F(TetrahedralMeshBase, VertexFaceIteratorTest) {
 
     }
 
-#if __cplusplus >= 201103L // C++11
+#if __cplusplus >= 201103L || _MSC_VER >= 1800 // C++11
     {
 
       std::set<VertexHandle> onering;
@@ -136,7 +136,7 @@ TEST_F(TetrahedralMeshBase, VertexFaceIteratorTest) {
 
 }
 
-#if __cplusplus >= 201103L // C++11
+#if __cplusplus >= 201103L || _MSC_VER >= 1800 // C++11
 TEST_F(HexahedralMeshBase, RangeForTest) {
     // no EXPECTs here, if it compiles, it'll work.
     generateHexahedralMesh(mesh_);

src/Unittests/unittests_smartptr.cc

 #include <gtest/gtest.h>
 
-#if __cplusplus >= 201103L
+#if __cplusplus >= 201103L || _MSC_VER >= 1800
 
 #include <OpenVolumeMesh/System/MemoryInclude.hh>