Fixes #1823

Documentation of security_groups argument doesn't mention VPC
Fix typo in SQS documentation
Merge pull request #1830 from masakazu-i/sqs-doc

Fix typo in SQS documentation
Fixing region endpoints for EMR to accomodate this bug (http://bugs.python.org/issue13034) in versions of Python earlier than 2.7.3.
Merge pull request #1824 from twork-veracode/develop

Update auto scaling documentation. Fixes #1824, #1823.
Merge pull request #1831 from garnaat/develop

Fixing region endpoints for EMR
Add support for new EMR APIs
Merge pull request #1836 from danielgtaylor/emr-update

Add support for new Elastic MapReduce APIs