fix mongo install script

.install_mongodb_on_travis.sh

@@ -9,10 +9,12 @@ if [ "$MONGODB" = "2.4" ]; then
     # No need for `sudo service mongodb start` because v2.4 starts automatically
 elif [ "$MONGODB" = "2.6" ]; then
     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=2.6.12
     sudo service mongodb start
 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
+    sudo apt-get update
     sudo apt-get install mongodb-org-server=3.0.14
     sudo service mongodb start
 else

.travis.yml

@@ -44,7 +44,7 @@ matrix:
     env: PYMONGO=3.0 MONGODB=3.0
 
 before_install:
-- bash .install_mongodb_on_travis.sh
+- ./.install_mongodb_on_travis.sh
 
 install:
 - sudo apt-get install python-dev python3-dev libopenjpeg-dev zlib1g-dev libjpeg-turbo8-dev