fix compilation error
Merge pull request #30 from littlewhitetwo/master

fix compilation error
Merge branch 'master' of github.com:gpmgo/gopm

Conflicts:
	cmd/bin.go
	cmd/build.go
	cmd/config.go
	cmd/exec.go
	cmd/gen.go
	cmd/get.go
	cmd/install.go
	cmd/run.go
	gopm.go