update dependency versions

update versions of:

- findup-sync (not important)
- minimatch (not important)
- nopt (1.0.10 -> 2.1.1) tests passed
- rimraf (2.0.2 -> 2.1.4) tests passed
- underscore.string (2.2.0rc -> 2.3.1) tests passed

Actually I want to update lodash (0.9.2 -> 1.0.1), but tests failed.