Allow options to be set on StaticMath fields.

Previously, StaticMath fields were only able to use the global configuration.
This change allows them to use customs options.  This is particularly useful
for passing configuration options into inner fields.
diff --git a/src/commands/math.js b/src/commands/math.js
index 63341e3..8cab99d 100644
--- a/src/commands/math.js
+++ b/src/commands/math.js
@@ -431,7 +431,10 @@
 API.StaticMath = function(APIClasses) {
   return P(APIClasses.AbstractMathQuill, function(_, super_) {
     this.RootBlock = MathBlock;
-    _.__mathquillify = function() {
+    _.__mathquillify = function(opts, interfaceVersion) {
+      if (interfaceVersion > 1) {
+        this.config(opts);
+      }
       super_.__mathquillify.call(this, 'mq-math-mode');
       this.__controller.delegateMouseEvents();
       this.__controller.staticMathTextareaEvents();