- Command `install` add support for downloading code from launchpad.net, bitbucket.org; probably, git.oschina.net, gitcafe.com, *.codeplex.com; hopefully, support user sources for downloading tarballs.
- Add feature for downloading through version control tools, and use `checkout` to switch to specific revision; this feature only be enabled when users use bundle or snapshot id.
- When choose which `GOPATH` to install, match with current path first, if it doesn't match any `GOPATH`, then install to the first path in the `GOPATH` variable.