Clarify that utils/launch.sh is MPL-2.0

Also, note in the top-level license file that the default noVNC
license for files that are not explicitly marked or mentioned in
the LICENSE.txt file are by default MPL-2.0 licensed.

LICENSE.txt

@@ -57,6 +57,10 @@ licenses (all MPL 2.0 compatible):
     utils/inflator.partial.js
     include/inflator.js        : MIT (for pako)
 
+Any other files not mentioned above are typically marked with
+a copyright/license header at the top of the file. The default noVNC
+license is MPL-2.0.
+
 The following license texts are included:
 
     docs/LICENSE.MPL-2.0

utils/launch.sh

@@ -1,5 +1,9 @@
 #!/usr/bin/env bash
 
+# Copyright 2016 Joel Martin
+# Copyright 2016 Solly Ross
+# Licensed under MPL 2.0 or any later version (see LICENSE.txt)
+
 usage() {
     if [ "$*" ]; then
         echo "$*"