made use of $JQ variable in script rather than relying on the $PATH
create image-instance.sh to create an ami for a given instance
made the AMI name 'unique' if possible
added a new tag to our objects, so we can later filter on these tags
added -h option to display the command usage
* added new option (-h, -p, -r)
* added support to specify one or more region as parameter
* added support fopr aws cli profile
* added usage() funcrtion to display a quick help
* added initial version of purge-expired-amis.sh to purge expired AMIs
* supports aws cli profile
* supports one or more region using -r
* deregister the ami first and then deletes associated snapshots
* only deletes amis and snapshots that have been created by image-instance.sh script
added minimal IAM policy with all the required parameters for all regions
sample cron file with various examples
fixed the name for the script in charge of expired snapshots
added installation script to automate the deployment
typo fix
added documentation in README.md