add JMESPath requirement

[runnabro]

This is the error you get if you don't have this installed:

ok: [localhost]

TASK [builder : set number of images built] ************************************
fatal: [localhost]: FAILED! => {"failed": true, "msg": "You need to install \"jmespath\" prior to running json_query filter"}
	to retry, use: --limit @/Users/tonyli/Runnable/devops-scripts/ansible/web.retry

PLAY RECAP *********************************************************************
localhost                  : ok=4    changed=0    unreachable=0    failed=1   

[anandkumarpatel]

do you also mind fixing examples to add .. and the main.yml file?