enabled cache in travis tests

Author: iolufemi

.travis.yml

@@ -4,7 +4,7 @@ services:
   - mongodb
   - redis-server
 env:
-  - MONGOLAB_URL=mongodb://127.0.0.1/snipe RATE_LIMIT=10 REDIS_URL=redis://127.0.0.1/1 SECURE_MODE=true
+  - MONGOLAB_URL=mongodb://127.0.0.1/snipe RATE_LIMIT=10 REDIS_URL=redis://127.0.0.1/1 SECURE_MODE=true NO_CACHE=no
 addons:
   apt:
     sources: