Merge pull request #377 from Arcterus/fix-pipe_writeln

common/util: make pipe_writeln! use writeln! instead of write!

src/common/util.rs

@@ -136,7 +136,7 @@ macro_rules! pipe_write(
 #[macro_export]
 macro_rules! pipe_writeln(
     ($fd:expr, $($args:expr),+) => (
-        match write!($fd, $($args),+) {
+        match writeln!($fd, $($args),+) {
             Ok(_) => true,
             Err(f) => {
                 if f.kind == ::std::io::BrokenPipe {