add grep glob test, * for file name, passes
add grep glob test, ** for dir name, fails it
fix typo
add test for common.expand() and pass it
add ** glob tests for common.expand() and fail it
implement globing and pass tests
fix order issue under node 0.8
remove dependcy on `minimatch`
improve tests on ** for directory name
Merge pull request #119 from utensil/118-grep-glob

grep() support for globing, fixes #118