Merge branch 'release-1.3.23' into develop

* release-1.3.23:
  Bumping version to 1.3.23
  Update changelog with latest changes
  EMR: changed to use regionalized buckets.
  EMR: Support installing hive-site.xml in create-cluster and install-applications commands.
Add boto/botocore#324 to changelog
Update changelog with latest changes
Update changelog
Bumping version to 1.3.24
Merge branch 'release-1.3.24'

* release-1.3.24:
  Bumping version to 1.3.24
  Update changelog
  Update changelog with latest changes
  Add boto/botocore#324 to changelog