Fix embedded files generation on OS X.

utility/embed-static.sh

@@ -21,8 +21,12 @@ do
   find . -type f \! -name \*.map \! -name bootstrap.js \! -name bootstrap-theme.css \! -name bootstrap.css | while read file
   do
     name=$(echo "${file}"|sed 's|\.\/||')
-    echo -n "\"$name\": []byte(\""
-    gzip -9 -c "${file}" | xxd -p | tr -d '\n' | sed 's/\(..\)/\\x\1/g'
+    # Using printf here instead of "echo -n" because the latter doesn't work on Mac OS X:
+    # http://hints.macworld.com/article.php?story=20071106192548833.
+    printf "\"$name\": []byte(\""
+    # The second newline deletion at the end is required for Mac OS X as well,
+    # as sed outputs a trailing newline there.
+    gzip -9 -c "${file}" | xxd -p | tr -d '\n' | sed 's/\(..\)/\\x\1/g' | tr -d '\n'
     echo "\"),"
     echo
   done