Fix stats test and stop spamming people

.travis.yml

@@ -14,3 +14,4 @@ notifications:
       - "irc.freenode.net#chihaya"
     on_success: always
     on_failure: always
+  email: false

config/example.json

@@ -4,7 +4,7 @@
   "addr": ":80",
 
   "cache": {
-    "driver": "redis",
+    "driver": "mock",
     "network": "tcp",
     "host": "127.0.0.1",
     "port": "6379",
@@ -17,7 +17,7 @@
   },
 
   "storage": {
-    "driver": "batter",
+    "driver": "gazelle",
     "host": "127.0.0.1",
     "port": "5432",
     "user": "postgres",

server/stats_test.go

@@ -13,6 +13,7 @@ import (
 
 	"github.com/chihaya/chihaya/config"
 
+	_ "github.com/chihaya/chihaya-gazelle"
 	_ "github.com/chihaya/chihaya/storage/tracker/mock"
 )