use string/vector container, refactor parser(parser.cpp), I think 70% complete.
add strip-series function for std::string
refactor parser by string/vector finish, parsing add some hw2 requirement
refactor ras.cpp for modified parser
bug fix, only test3 and test5 in hw1 doesn't pass
add cscope file to .gitignore, makefile support FreeBSD by using gmake
test5 too-many pipe bug fix: add close pipe at end of executing line command
add testcase 7~9, modify test_ans rule

test_ans rule
    before: running testcase in clean(origin) environment(ras/)
    now: running testcase 1~9 orderly without clean environment(ras/)