0.13.3

0.13.3 (13-October-2016)

This minor solves some problems with ConfigureEnvironment, mainly for Windows, but also fixes
other things:

• Fixed concatenation problems in Windows for several environment variables. Fixed problems with
  path with spaces
• A batch file is created in Windows to be called, as if defined structures doesn't seem to
  work in the command line.
• The vcvars_command from tools now checks the Visual Studio environment variable, if it is
  already set, it will check it with the current project settings, throwing an error if not matching,
  returning an empty command if matches.
• Added a compile_flags property to ConfigureEnvironment, to be passed in the command line
  to the compiler, but not as environment variables
• Added defines to environment for nix systems, it was not being handled before
• Added new tests, compiling simple projects and diamond dependencies with cmake, cl (msvc), gcc (gcc in linux, mingw in win)
  and clang (OSX), for a better coverage of the ConfigureEnvironment functionality.
• Fixed wrong CPP_INCLUDE_PATH, it is now CPLUS_INCLUDE_PATH