Release v2.2.0 - 2015-11-12

Tag release v2.2.0

References:
#969, #979, #984, #985, #987, #990

• Feature - Aws::RDS - Adds support for cross-account snapshot sharing and
  modifying DB instance visibility.

• Upgrading - Aws::S3::Client - All Aws::S3::Client instances will default to
  using Signature Version 4 in all regions. This replaces the behavior where a
  subset of regions used the 's3' signer and would attempt to upgrade only when
  encountering signing errors.

  If you wish to continue using the 's3' signer, without auto-upgrade logic, you
  can manually choose to use the 's3' signer at client creation time:

  client = Aws::S3::Client.new(signature_version: 's3')

• Issue - Aws::EC2 - Fix for :instance_exists waiter. Instances that have been
  terminated for a long period of time could fail the previous waiter definition
  with a false positive.

  See related GitHub pull request #985.

• Upgrading - Resources - All batch resource operations have been renamed to make
  it clear that they operate in batches on the entire collection.

  • All batch operations are now prefixed with batch_, e.g. #start
    is now #batch_start.
  • All batch operations named "delete" or "terminate" are now suffixed
    with a !, e.g. #delete is now #batch_delete!

  For backwards compatibility, existing batch methods still respond
  to their old names with a deprecation warning. New batch operations
  will strictly follow the new conventions.