Added some todo items

TODO-0.1.txt

@@ -30,6 +30,11 @@ CODE
 
     * Go over sandbox and figure out what is still relevant
 
+    * Make 'merge' optimizer the default (since math optimizer is broken)
+    * Rename 'merge' optimizer to 'simple' optimizer (and non-optimizer to
+    'null')
+        * Update documentation accordingly
+
 EPYDOC
     * Add WRITEME to code
     * Go over and remove all WRITEME