Add suggested Doctrine and Propel deps for test suite coverage

.travis.yml

@@ -6,7 +6,7 @@ php:
 
 before_script:
   - wget -nc http://getcomposer.org/composer.phar
-  - php composer.phar install
+  - php composer.phar install --install-suggests
 
 script: phpunit
 

composer.json

@@ -16,6 +16,11 @@
         "symfony/console": "2.0.*",
         "ruflin/elastica": "*"
     },
+    "suggest": {
+        "doctrine/orm": "2.2.*",
+        "doctrine/mongodb-odm": "dev-master",
+        "propel/propel1": "1.6.*"
+    },
     "autoload": {
         "psr-0": { "FOQ\\ElasticaBundle": "" }
     },