JSON Schema Compiler: Added event compilation.

tools/json_schema_compiler/test/choices.json

 [
   {
     "namespace": "choices",
     "types": [],
     "functions": [
       {
         "name": "takesIntegers",
         "type": "function",
         "description": "Takes one or more integers.",
         "parameters": [
@@ skipping 77 matching lines @@
                 "name": "result",
                 "choices": [
                    {"type": "array", "items": {"type": "integer", "minimum": 0}},
                    {"type": "integer"}
                  ],
                 "description": "Some integers."
               }
             ]
           }
         ]
+      },
+      {
+        "name": "returnMultipleChoices",
+        "type": "function",
+        "description": "Gives back two values where each is an integer or a list of integers.",
+        "parameters": [
+          {
+            "name": "callback",
+            "type": "function",
+            "parameters": [
+              {
+                "name": "firstResult",
+                "choices": [
+                   {"type": "array", "items": {"type": "integer", "minimum": 0}},
+                   {"type": "integer"}
+                 ],
+                "description": "Some integers."
+              },
+              {
+                "name": "secondResult",
+                "choices": [
+                   {"type": "array", "items": {"type": "integer", "minimum": 0}},
+                   {"type": "integer"}
+                 ],
+                "description": "Some integers."
+              }
+            ]
+          }
+        ]
       }
     ]
   }
 ]