Merge pull request #4793 from ilkka/patch-2

Fix code block quoting in documentation
Make it slightly more clear what side of the connection is missing keyczar if using accelerate mode.
Clarify a warning message.
Fixes from docker-ansible, update license to be same as other modules
fix for https://github.com/ansible/ansible/issues/4795
Incorrect changed result in cron module.
Report changed=False if no cron is removed:wq
AWS_ACCESS_KEY misspelt in shared EC2 connection library
only require absolute paths for hardlinks
skip absolute path creation for old_src, not needed with the new relative links
typo ---- (4) instead of --- (3)
Merge pull request #4802 from benregn/patch-1

Couple of small typos
Merge pull request #4798 from willthames/aws_access_key_fix

AWS_ACCESS_KEY misspelt in shared EC2 connection library
Don't fail if ec2_access_key/ec2_secret_key not specified to use IAM role.
Add a timeout to the synchronize module to prevent infinite hangs while waiting on passwords for misconfigured users
Update synchronize docstrings for rsync_timeout parameter
Addresses #4676 Add module notes about the behavior of sudo and the destination paths within the synchronize module.
return True/False from remove_job_file()
revised fix for https://github.com/ansible/ansible/issues/4795
Fixes #4485 add an ipv6 parameter to accelerate so that the daemon will bind to an ipv6 port instead of ipv4
Remove invalid ipv6 parameter from setup execution
Addresses #4763 list python >= 2.5 as a requirement for accelerate mode
Merge pull request #4772 from mscherer/fix_4763

Try/finally is a python 2.5 construct, so not working on EL5. Fix #4763