travis - upgrade mongodb

.travis.yml

@@ -9,14 +9,18 @@ services:
 
 before_install:
   - mysql -e "CREATE DATABASE IF NOT EXISTS vegas_test;" -uroot
+  - 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
 
 before_script:
   - phpenv config-add travis/php.ini
   - git clone -q --depth=1 https://github.com/phalcon/cphalcon.git -b master
   - (cd cphalcon/ext; export CFLAGS="-g3 -O1 -fno-delete-null-pointer-checks -Wall"; phpize && ./configure --enable-phalcon && make -j4 && sudo make install && phpenv config-add ../unit-tests/ci/phalcon.ini)
   - curl -s http://getcomposer.org/installer | php
   - php composer.phar install --dev
-
+  
 script:
   - cp tests/config.sample.php tests/config.php
   - mkdir -p tests/fixtures/cache