GUACAMOLE-773: Add license information for new JavaScript dependencies pulled in by Webpack.

doc/licenses/make-plural-3.0.6/LICENSE

@@ -0,0 +1,13 @@
+Copyright (c) 2014-2016 by Eemeli Aro <eemeli@gmail.com>
+
+Permission to use, copy, modify, and/or distribute this software for any
+purpose with or without fee is hereby granted, provided that the above
+copyright notice and this permission notice appear in all copies.
+
+THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.

doc/licenses/make-plural-3.0.6/README

@@ -0,0 +1,8 @@
+make-plural (https://github.com/eemeli/make-plural)
+---------------------------------------------------
+
+    Version: 3.0.6
+    From: 'Eemeli Aro' (https://github.com/eemeli)
+    License(s):
+        ISC (bundled/make-plural-3.0.6/LICENSE)
+

doc/licenses/make-plural-3.0.6/dep-coordinates.txt

@@ -0,0 +1 @@
+make-plural:3.0.6