Bug fixed

cmd/build.go

@@ -15,6 +15,8 @@
 package cmd
 
 import (
+	"os"
+
 	"github.com/codegangsta/cli"
 
 	"github.com/gpmgo/gopm/doc"
@@ -45,5 +47,8 @@ func runBuild(ctx *cli.Context) {
 		log.Fatal("", err.Error())
 	}
 
+	// I don't know why, but there is a folder named "~".
+	os.RemoveAll("~")
+
 	log.Success("SUCC", "Build", "Command execute successfully!")
 }