Removed dependance on os/user

This was done to make cross-compiling work again

config.go

@@ -7,7 +7,6 @@ import (
 	"io/ioutil"
 	"log"
 	"os"
-	"os/user"
 	"strings"
 )
 
@@ -50,12 +49,9 @@ func LoadConfig(filename string) (Config, error) {
 		MaxPoints:     MAX_POINTS,
 		Mode:          DEFAULT_MODE,
 	}
-	u, err := user.Current()
-	if err != nil {
-		return c, err
-	}
+	home := os.Getenv("HOME")
 	if len(filename) > 1 && filename[:2] == "~/" {
-		filename = strings.Replace(filename, "~", u.HomeDir, 1)
+		filename = strings.Replace(filename, "~", home, 1)
 	}
 	if _, err := os.Stat(filename); os.IsNotExist(err) {
 		log.Printf("%+v not found, using defaults", filename)