Docker mix and match setup

Rewrite of the docker setup. Now uses fig to manage containers and container
linkage. The base is a block based mix and match, which will give you the
possibility to easily test all configurations.

docker/blocks/option_cache_redis/config

@@ -0,0 +1,3 @@
+[cache]
+DB_TYPE = redis
+HOST = ${CACHE_1_PORT_6379_TCP_ADDR}:${CACHE_1_PORT_6379_TCP_PORT}