added new dependencies and added redis support

somehow there is a problem with the parameters.yml and environment
variables. ansible templates are now used.

database migration is still a big problem.

root/etc/ansible/templates/parameters.yml.j2

@@ -0,0 +1,41 @@
+parameters:
+    database_driver: {{ database_driver }}
+    database_host: {{ database_host }}
+    database_port: {{ database_port }}
+    database_name: {{ database_name }}
+    database_user: {{ database_user }}
+    database_password: {{ database_password }}
+    database_path: "%kernel.root_dir%/../data/db/wallabag.sqlite"
+    database_table_prefix: wallabag_
+
+    mailer_transport:  smtp
+    mailer_host:       127.0.0.1
+    mailer_user:       ~
+    mailer_password:   ~
+
+    locale:            en
+
+    # A secret key that's used to generate certain security-related tokens
+    secret: ovmpmAWXRCabNlMgzlzFXDYmCFfzGv
+
+    # two factor stuff
+    twofactor_auth: true
+    twofactor_sender: no-reply@wallabag.org
+
+    # fosuser stuff
+    fosuser_registration: true
+    fosuser_confirmation: true
+
+    from_email: no-reply@wallabag.org
+
+    rss_limit: 50
+
+    # RabbitMQ processing
+    rabbitmq_host: localhost
+    rabbitmq_port: 5672
+    rabbitmq_user: guest
+    rabbitmq_password: guest
+
+    # Redis processing
+    redis_host: redis
+    redis_port: 6379