Merge branch 'master' into 'develop'

# Conflicts:
#   README.md

README.md

@@ -31,7 +31,7 @@ Additionally we require the following libraries to be found:
 - [SuiteSparse](http://faculty.cse.tamu.edu/davis/suitesparse.html) (optional)
 - libalberta >= 3.0 (For Alberta-Grids)
 
-And a compiler that supports the C++14 standard, e.g. g++ >= 4.9 and clang >= 3.6, and cmake >= 3.1.
+And a compiler that supports the C++14 standard, e.g. g++ >= 5.0 and clang >= 3.6, and cmake >= 3.1.
 
 If your MTL4 installation is not found by default, you have to specify the path,
 where the file `MTLConfig.cmake` is found, here called `MTL_ROOT`. Then simply use