Update changelog with latest changes
Bumping version to 1.3.18
Merge branch 'release-1.3.18' into develop

* release-1.3.18:
  Bumping version to 1.3.18
  Update changelog with latest changes
Updates to SES topics and some fixes for autoscaling and rds.
Optional s3 sync flag to address timestamp issues described in https://github.com/aws/aws-cli/issues/599
Update Changelog with latest bugfixes
Merge branch 'EronHennessey-doc_updates' into develop

* EronHennessey-doc_updates:
  removed tab chars from a topic, and removed a bad link from another
Merge branch 'EronHennessey-doc_updates_ses' into develop

* EronHennessey-doc_updates_ses:
  Updates to SES topics and some fixes for autoscaling and rds.
EMR: Bug fix in install-applications and create-cluster

1. Rename --apps to --applications in install-applications
2. Fixed bug in create-cluster --applications Name=MapR where Args is required.
EMR: Add unit tests for application
EMR: Update create-default-roles and Add --service-role & --use-default-roles
Test failure fix
Update changelog with latest changes
Bumping version to 1.3.19
Merge branch 'release-1.3.19' into develop

* release-1.3.19:
  Bumping version to 1.3.19
  Update changelog with latest changes
  Test failure fix
  EMR: Update create-default-roles and Add --service-role & --use-default-roles
  EMR: Add unit tests for application
  EMR: Bug fix in install-applications and create-cluster
Let aws.cmd find python.exe on paths with spaces.

Before this commit, you'd get a vague "\Python\python.exe was unexpected at this time." message
when Python is installed in "C:\Program Files (x86)\Python". This fix always surrounds the
PythonExe variable's value with quotes so `if [%PythonExe%]==[""]` doesn't break.
Add customizations for cloudsearchdomain command

* Rename --query to --search-query to avoid shadowing our --query arg
* Add validation to require --endpoint-url when using cloudsearch domain
  commands.
Update changelog with latest changes
Bumping version to 1.3.20
Merge branch 'release-1.3.20' into develop

* release-1.3.20:
  Bumping version to 1.3.20
  Update changelog with latest changes
  Add customizations for cloudsearchdomain command