progress: windows build with visual compiler
regression: clang build was built with gcc
progress: removed user-defined literals
          src/Tupfile updated
safe version of localtime is used (platform dependent)
obj files ignored
.obj instead of .o in case of win32
alias template and constexpr removed since not supported by VC
more unsupported c++ features removed/worked around
just for sure, Ref's ctor is deleted
template alias workaround applied, user defined literals removed
clang is the main compiler on linux, gcc builds removed
some progress with VC++ compatibility
compiles with VC, but crashes
gitignore update
VC strftime does not support %F or %X
__FUNCTION__ is nicer than __FUNCDNAME__ under MSVC
gitignore updated
localtime_r was not called properly
fine-tune src/Tupfile on linux
unit tests were updated according to removed c++11 features