Merge branch 'hotfix-0.95.4' into develop
bump version back to development status (0.9999)
docs: update image host command with -I,-m options

Using these options instead of -i and -n prevents an issue where the
default cluster template in the config may override these values if
master_instance_type and master_image_id are defined. This ensures the
user gets exactly the instance type and base AMI they are expecting when
launching the image host regardless of their config.

closes gh-388
Add support for R3 instance types
Merge branch 'r3-instance-type-support' into develop

closes gh-392
closes gh-393
cluster: fix bug in _create_flat_rate_cluster

Only call Cluster.create_nodes if the launch map actually contains
aliases for the image/type. This is a regression introduced from the
changes in 0.95.4.
bump version to 0.95.5
Changelog: update for 0.95.5 release
bump year in license header on all source files
Merge branch 'hotfix-0.95.5'