[cxxtags_merger] Added "--force" option for rebuild mode.
[cxxtags][bug-fix] Fixed a typo.
[cxxtags] Changed to use getopt().
[env] Updated Makefile.
[cxxtags] make option parsing compatible with linux.
[test] Update tests. Changed to use environment variable LLVM_HOME.
[env] Added an include path.
[env] Added common rules.
[test] Updated a test.