Azurerm

- BREAKING CHANGE:
- Changed how container instance groups are handled, in order to manage multiple container instances in a group
- Added helper function: create_container_definition(container_name, image, port=80, cpu=1.0, memgb=1.5, environment=None)
- Create a list of these definitions which is then passed to create_container_group()
- changed other container instance functions to work at a group level
- create_container_group(access_token, subscription_id, resource_group, container_group_name,
container_list, location, ostype='Linux', port=80, iptype='public')
- delete_container_group(access_token, subscription_id, resource_group, container_group_name)
- get_container_group(access_token, subscription_id, resource_group, container_group_name)
- get_container_logs(access_token, subscription_id, resource_group, container_group_name, container_name=None)
- list_container_groups(access_token, subscription_id, resource_group)
- list_container_groups_sub(access_token, subscription_id)

- ISO time format fix for get_access_token_from_cli()

- Added error checking to get_access_token_from_cli() to check accessToken hasn't expired

- BREAKING CHANGE:
- ACS Windows support - Added admin_password and ostype=[Linux/Windows] arguments to create_container_service()
- 'location' parameter now comes before public_key parmeter (which is now optional, as not required for ostype='Windows')

- Added support for container instances preview
- New functions: create_container_instance, detete_container_instance, get_container_instance
- list_container_instances_sub, list_container_instances, list_container_instances_sub

- Change get_subscription_from_cli() to read utf-8-sig encoding
- Not sure why this became necessary after working before - will need to do more testing of this