ec2_vol module: add support for name / id to mount volume on instance

Merge branch 'drcapulet/ec2-sourcedestcheck' of https://github.com/drcapulet/ansible into drcapulet-drcapulet/ec2-sourcedestcheck

Add rax_identity module

[s3] Compatibility with fakes3.

Fix for #4992 - Add userdata to cloud/nova_compute

Merge branch 'ec2_security_token' of https://github.com/willthames/ansible into willthames-ec2_security_token

Elasticache vpc security groups

Allow ec2_tag module to print the tags of an instance

Add new cloud/rds DB instance types (db.m3 and db.cr1 families)

ec2.py: Make sure ec2_placement gets handled correctly

cloud/ec2_elb module: Added wait_timeout parameter

Make sure droplet deletion works even when idempotency is achieved using 'name' and 'unique_name' rather than 'id'

nova_compute: fix for partial match b/w params['name'] and an existing name

Make it easier to determine whether instance creation or tagging fails

BUGFIX: route53 module won't round-trip * and @ in records

Fix for #6365: cloudformation module fails to update if stack exists

Returning 'NA' when no virtualization found

Added modules to manage ec2 autoscaling groups

Update apt module so that environment variables are set correctly since not going through shell.  Very sorry folks, it will be addressed.

Document the module_lang option.

ad-hoc doc fixes

Closes #6169.