Add playbook including all others

so we only have to select the hosts to run on.

README.md

@@ -24,7 +24,7 @@ Deploy
 ------
 To deploy e.g. the jenkins master user:
 ```
-$ ansible-playbook -i ./inventory.yml ./install_jenkins.yml -s --check -l jenkinsmaster
+$ ansible-playbook -i ./inventory.yml ./playbook.yml -s --check -l jenkinsmaster
 ```
 If everything looks o.k. rerun without *--check*.
 

playbook.yml

+- include: install_jenkins.yml
+- include: jenkinsnodes.yml