Allow int values for double/float fields (fixes #4)

Author: shramov

json2pb.cc

@@ -164,8 +164,8 @@ static void _json2field(Message &msg, const FieldDescriptor *field, json_t *jf)
 			break;					\
 		}
 
-		_CONVERT(CPPTYPE_DOUBLE, double, "f", SetDouble, AddDouble);
-		_CONVERT(CPPTYPE_FLOAT, double, "f", SetFloat, AddFloat);
+		_CONVERT(CPPTYPE_DOUBLE, double, "F", SetDouble, AddDouble);
+		_CONVERT(CPPTYPE_FLOAT, double, "F", SetFloat, AddFloat);
 		_CONVERT(CPPTYPE_INT64, json_int_t, "I", SetInt64, AddInt64);
 		_CONVERT(CPPTYPE_UINT64, json_int_t, "I", SetUInt64, AddUInt64);
 		_CONVERT(CPPTYPE_INT32, json_int_t, "I", SetInt32, AddInt32);

test.json

@@ -2,6 +2,7 @@
   "_str": "b",
   "_bin": "0a0a0a0a",
   "_bool": true,
+  "_float": 1,
   "sub": {
     "field": "subfield", 
     "echo": [