embed: turn source path to absolute for error-less copy (#198)

Signed-off-by: Mohammed Al Sahaf <msaa1990@gmail.com>

io.go

@@ -12,6 +12,7 @@ import (
 
 // copy recursively copies src into dst with src's file modes.
 func copy(src, dst string) error {
+ src, _ = filepath.Abs(src)
  src = filepath.ToSlash(src)
  dst = filepath.ToSlash(dst)
  log.Printf("[INFO] copying files: src=%s dest=%s", src, dst)