Add soy and velocity to syntax highlight

Use case is google and other teams use soy and velocity.

Change-Id: I6a36b4c6cb761f0a3deec50fce8cff99a1b6dd9b
diff --git a/gr-editor/gr-editor.html b/gr-editor/gr-editor.html
index 0b7232f..9a11cbb 100644
--- a/gr-editor/gr-editor.html
+++ b/gr-editor/gr-editor.html
@@ -47,7 +47,9 @@
   <script src="../bower_components/codemirror-minified/mode/ruby/ruby.js" ></script>
   <script src="../bower_components/codemirror-minified/mode/sass/sass.js" ></script>
   <script src="../bower_components/codemirror-minified/mode/shell/shell.js" ></script>
+  <script src="../bower_components/codemirror-minified/mode/soy/soy.js" ></script>
   <script src="../bower_components/codemirror-minified/mode/sql/sql.js" ></script>
+  <script src="../bower_components/codemirror-minified/mode/velocity/velocity.js" ></script>
   <script src="../bower_components/codemirror-minified/mode/xml/xml.js" ></script>
   <script src="../bower_components/codemirror-minified/mode/yaml/yaml.js" ></script>
   <script src="../bower_components/codemirror-minified/addon/fold/foldcode.js" ></script>