added support for a single centralized configuration
README update
Merge branch 'config-spike' of https://github.com/alexec/docker-java
into alexec-config-spike

Conflicts:
	src/main/java/com/kpelykh/docker/client/DockerClient.java
Merge branch 'master' into alexec-config-spike
Merge branch 'alexec-config-spike'