- Integration tests had to be disabled with 2012 and 2013. There were
few (4) tests failing for these cases.
- Only bring libiconv with conan when a windows subsystem is detected.
- libiconv can be enabled now with a conan option.
- Use infinity instead of INFINITY
- Use conan_basic_setup(). Fixes a problem with gtest is VS2012
- call vcvarsall.bat for each compiler version so that nmake can be
found.