Add more compilers to appveyor config
Add more compilers to appveyor config

unittest-cpp/unittest-cpp,pjohnmeyer/unittest-cpp,pjohnmeyer/unittest-cpp,grahamreeds/unittest-cpp,unittest-cpp/unittest-cpp,jasonhorsburgh/unittest-cpp,jasonhorsburgh/unittest-cpp,grahamreeds/unittest-cpp,unittest-cpp/unittest-cpp,grahamreeds/unittest-cpp