Fix .install_mongodb_on_travis.sh script (all credit to @erdenezul)

.install_mongodb_on_travis.sh

@@ -1,5 +1,6 @@
 #!/bin/bash
 
+sudo apt-get remove mongodb-org-server
 sudo apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv 7F0CEB10
 
 if [ "$MONGODB" = "2.4" ]; then
@@ -13,7 +14,7 @@ elif [ "$MONGODB" = "2.6" ]; then
     sudo apt-get install mongodb-org-server=2.6.12
     # service should be started automatically
 elif [ "$MONGODB" = "3.0" ]; then
-    echo "deb http://repo.mongodb.org/apt/ubuntu precise/mongodb-org/3.0 multiverse" | sudo tee /etc/apt/sources.list.d/mongodb.list
+    echo "deb http://repo.mongodb.org/apt/ubuntu trusty/mongodb-org/3.0 multiverse" | sudo tee /etc/apt/sources.list.d/mongodb.list
     sudo apt-get update
     sudo apt-get install mongodb-org-server=3.0.14
     # service should be started automatically
@@ -21,3 +22,6 @@ else
     echo "Invalid MongoDB version, expected 2.4, 2.6, or 3.0."
     exit 1
 fi;
+
+mkdir db
+1>db/logs mongod --dbpath=db &