install latest mongo in travis, travis only has 2.4.10

.travis.yml

@@ -1,9 +1,14 @@
 services:
     - redis-server
-    - mongodb
 before_install:
+    - "sudo apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv 7F0CEB10"
+    - "echo 'deb http://downloads-distro.mongodb.org/repo/ubuntu-upstart dist 10gen' | sudo tee /etc/apt/sources.list.d/mongodb.list"
+    - "sudo apt-get update"
+    - "sudo apt-get install mongodb-org-server"
     - npm i --production
     - node app --setup="{\"url\":\"http://127.0.0.1:4567/\",\"secret\":\"abcdef\",\"database\":\"mongo\",\"mongo:host\":\"127.0.0.1\",\"mongo:port\":27017,\"mongo:username\":\"\",\"mongo:password\":\"\",\"mongo:database\":0,\"redis:host\":\"127.0.0.1\",\"redis:port\":6379,\"redis:password\":\"\",\"redis:database\":0,\"admin:username\":\"admin\",\"admin:email\":\"test@example.org\",\"admin:password\":\"abcdef\",\"admin:password:confirm\":\"abcdef\"}" --ci="{\"host\":\"127.0.0.1\",\"port\":27017,\"database\":0}"
+before_script:
+    - "until nc -z localhost 27017; do echo Waiting for MongoDB; sleep 1; done"
 language: node_js
 node_js:
     - "0.11"