Support geo_location in ResourceRecordSet
Mention global stubbing in README
API Updates for Elastic Load Balancing

Adds support for tagging to Elastic Load Balancing.
Tag release v1.51.0

References:
  #592
Updates to the LoginProfile Class

update the login profile class to support forced login as documented
here:
http://docs.aws.amazon.com/IAM/latest/APIReference/API_UpdateLoginProfile.html
Update the documentation

updated the documentation to include the param so it gets nicely
generated in the sdk docs
Merge pull request #600 from aughban/master

Update the login profile class to support forced password reset
x-amz-acl query string is case sensitive
Changed the default signature version for Amazon EC2 to sigv4.
Now producing two gem artifacts, `aws-sdk` and `aws-sdk-v1`.

Adding `aws-sdk-v1` gem, making it possible for v1 and v2
of the AWS SDK for Ruby to be loaded in the same Ruby
process.

Also updated the README with information about using proper version
constraints in Gemfile.
Updated Gemfile to use the aws-sdk-v1 gemspec.
Disabled default proxies when requesting credentials from EC2.

Net::HTTP automatically creates a proxy if the HTTP proxy
environment variable is set. By passing a `nil` value to
`Net::HTTP.new` for the `proxy_address`, Net::HTTP
skips this.
Added end attribute - The time when the Reserved Instance expires.
Don't Call Dir.home in Ruby 1.8

When attempting to build a SharedCredentialFileProvider in Ruby < 1.9,
you would see a confusing error when Dir.home raises a NoMethodError.

This change checks your RUBY_VERSION and raises a more user-friendly
ArgumentError in that case. It will also prevent a premature crash of
the default credential provider chain when running Ruby 1.8.

Resolves GitHub Issue #604
Merge pull request #605 from aws/issue604

Don't Call Dir.home in Ruby 1.8
Merge pull request #603 from neelakanta/master

Added end attribute - The time when the Reserved Instance expires.
Removed the 'aws-sdk-v1.rb' script from the `aws-sdk` gem.

This file is only being made available via the `aws-sdk-v1` gem
to ensure the proper gem is loaded.
The aws-sdk.gemspec now simply requires the aws-sdk-v1 gem.
Added `#type` and `#encypted` attributes to `AWS::EC2::Volume`.

Fixes #607
memoizing etag, content-length and last-modified from list request on s3object