memoizing etag, content-length and last-modified from list request on s3object
adding tests for etag, content_length and last_modified memoization on s3object
parsing data when memoizing content_length and last_modified on s3::object_collection
parsing data when memoizing content_length and last_modified on s3::object_collection
adding configuration for s3 to cache object attributes from ListBucket
last_modified is already a Time instance
Fix typo in AWS::IAM::ServerCertificate upload_date documentation.
Merge pull request #610 from bzanchet/master

memoizes data available on the ListBucket request
Merge pull request #627 from simi/master

Fix typo in AWS::IAM::ServerCertificate upload_date documentation.
Fix typo in the aws repl commandline client help page
Merge pull request #630 from deiv/fix-aws-repl-commandline-interface-help-page

Fix typo in the aws repl commandline client help page
Fixed ArgumentError raise.

See #604
Reverted hash syntax to 1.8.7 compat format.
Resolved ruby 1.8 test issue.
Removed an un-supported API operation.

Closes #633
Removed docs for a non-existant method.

See #633
Added support to LaunchConfigurationCollection#create for :placement_tenancy.

Fixes #631
Removed lib/aws-sdk.rb from the `aws-sdk-v1` gem.

This was causing issues for users with the v2 `aws-sdk`
gem in the same application. If the v1 gem was loaded first,
then `require 'aws-sdk'` would not load v2.

See https://github.com/aws/aws-sdk-core-ruby/issues/119
Tag release v1.54.0

References:
  #604, #610, #627, #630, #631, #633