Add method to retrieve title textview

For getting access to the title textview, to change visibility etc.

README.md

@@ -290,6 +290,13 @@ MaterialDialog dialog = //... initialization via the builder ...
 View view = dialog.getCustomView();
 ```
 
+If you want to get a reference to the title textview (e.g. to change visibility):
+
+```java
+MaterialDialog dialog = //... initialization via the builder ...
+TextView title = dialog.getTitleTextView();
+```
+
 If you want to get a reference to one of the dialog action buttons (e.g. to enable or disable buttons):
 
 ```java

library/src/main/java/com/afollestad/materialdialogs/MaterialDialog.java

@@ -849,6 +849,16 @@ public class MaterialDialog extends DialogBase implements View.OnClickListener,
         }
     }
 
+    /**
+     * Retrieves the title textview of the dialog, allowing you to modify properties such as whether or not it's enabled.
+     *
+     * @return The view from the dialog's layout representing the title textview.
+     */
+    public final TextView getTitleTextView() {
+        if (view == null) return null;
+		return title;
+    }
+
     /**
      * Updates an action button's title, causing invalidation to check if the action buttons should be stacked.
      *