EMR: Support installing hive-site.xml in create-cluster and install-applications commands.
EMR: changed to use regionalized buckets.
Update changelog with latest changes
Bumping version to 1.3.23
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