README: Add IRC link, CHANGES.md, and minor fixes

CHANGES.md

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+# Typhoon
+
+Notable changes between versions.
+
+## v1.7.5
+
+* Kubernetes v1.7.5
+* Use kubernete-incubator/bootkube v0.6.2
+* Add AWS Terraform module (alpha)
+* Add support for Calico networking (bare-metal, Google Cloud, AWS)
+* Change networking default from "flannel" to "calico"
+
+#### AWS
+
+* Add `network_mtu` to allow CNI interface MTU customization
+
+#### Bare-Metal
+
+* Add `network_mtu` to allow CNI interface MTU customization
+
+## v1.7.3
+
+* Kubernetes v1.7.3
+* Use kubernete-incubator/bootkube v0.6.1
+
+#### Digital Ocean
+
+* Add cloud firewall rules (requires Terraform v0.10)
+* Change nodes tags from strings to DO tags
+
+## v1.7.1
+
+* Kubernetes v1.7.1
+* Use kubernete-incubator/bootkube v0.6.0
+* Add Bare-Metal Terraform module (stable)
+* Add Digital Ocean Terraform module (beta)
+
+#### Google Cloud
+
+* Remove `k8s_domain_name` variable, `cluster_name` + `dns_zone` resolves to controllers
+* Rename `dns_base_zone` to `dns_zone`
+* Rename `dns_base_zone_name` to `dns_zone_name`
+
+## v1.6.7
+
+* Kubernetes v1.6.7
+* Use kubernete-incubator/bootkube v0.5.1
+
+## v1.6.6
+
+* Kubernetes v1.6.6
+* Use kubernete-incubator/bootkube v0.4.5
+* Disable locksmithd on hosts, in favor of [CLUO](https://github.com/coreos/container-linux-update-operator).
+
+## v1.6.4
+
+* Kubernetes v1.6.4
+* Add Google Cloud Terraform module (stable)
+
+## Earlier
+
+Earlier versions, back to v1.3.0, used different designs and mechanisms.