message: Get rid of some spurious whitespace in PPMEncoder
diff: @@ -59,20 +59,15 @@ impl<'a, W: Write> PPMEncoder<'a, W> {
  let _ = try!(self.w.write_all(&[buf[i]]));
  }
  }
  -
  RGB(8) => try!(self.w.write_all(buf)),
  RGB(16) => try!(self.w.write_all(buf)),
  RGBA(8) => {
  for x in buf.chunks(4) {
  -
  let _ = try!(self.w.write_all(&[x[0]]));
  -
  let _ = try!(self.w.write_all(&[x[1]]));
  -
  let _ = try!(self.w.write_all(&[x[2]]));
  }
  }
  -
  a => panic!(format!("not implemented: {:?}", a))
  }
  