重构框架，增加比赛功能

hydro/model/index.js

@@ -0,0 +1,13 @@
+module.exports = {
+    blacklist: require('./blacklist'),
+    builtin: require('./builtin'),
+    contest: require('./contest'),
+    opcount: require('./opcount'),
+    problem: require('./problem'),
+    record: require('./record'),
+    solution: require('./solution'),
+    system: require('./system'),
+    token: require('./token'),
+    training: require('./training'),
+    user: require('./user')
+};