Add homebrew devel/HEAD notes to docs and cleanup

Added to brew in https://github.com/Homebrew/homebrew-core/pull/20464

docs/development/homebrew.md

@@ -1,3 +1,26 @@
+# Installing Kops via Hombrew
+
+Homebrew makes installing kops [very simple for MacOS.](../install.md)
+```bash
+brew update && brew install kops
+```
+
+Development Releases and master can also be installed via Homebrew very easily:
+```bash
+# Development Release
+brew update && brew install kops --devel
+# HEAD of master
+brew update && brew install kops --HEAD
+```
+
+Note: if you already have kops installed, you need to substitute `upgrade` for `install`. 
+
+You can switch between development and stable releases with:
+```bash
+brew switch kops 1.7.1
+brew switch kops 1.8.0-beta.1
+```
+
 # Releasing kops to Brew
 
 Submitting a new release of kops to Homebrew is very simple.
@@ -8,11 +31,20 @@ Submitting a new release of kops to Homebrew is very simple.
 This will automatically update the provided fields and open a PR for you. 
 More details on this script are located [here.](https://github.com/Homebrew/brew/blob/master/Library/Homebrew/dev-cmd/bump-formula-pr.rb)
 
+We now include both major and development releases in homebrew.  A development version can be updated by adding the `--devel` flag.
+
 Example usage:
-```
+```bash
+# Major Version
 brew bump-formula-pr \
        --url=https://github.com/kubernetes/kops/archive/1.7.1.tar.gz \
        --sha256=044c5c7a737ed3acf53517e64bb27d3da8f7517d2914df89efeeaf84bc8a722a
+
+# Development Version
+brew bump-formula-pr \
+       --devel \
+       --url=https://github.com/kubernetes/kops/archive/1.8.0-beta.1.tar.gz \
+       --sha256=81026d6c1cd7b3898a88275538a7842b4bd8387775937e0528ccb7b83948abf1
 ```
 
 * Update the URL variable to the tar.gz of the new release source code

docs/install.md

@@ -8,6 +8,8 @@ From Homebrew:
 brew update && brew install kops
 ```
 
+Developers can also easily install [development releases](development/homebrew.md).
+
 From Github:
 
 ```bash

docs/update_kops.md

@@ -1,13 +1,33 @@
-## How to update Kops - Kubernetes Ops
+# Updating kops (Binaries)
 
-Update the latest source code from kubernetes/kops
+## MacOS
 
-```
-cd ${GOPATH}/src/k8s.io/kops/
-git pull && make
-```
+From Homebrew:
 
-Alternatively, if you installed from Homebrew
-```
+```bash
 brew update && brew upgrade kops
 ```
+
+From Github:
+
+```bash
+rm -rf /usr/local/bin/kops
+wget -O kops https://github.com/kubernetes/kops/releases/download/$(curl -s https://api.github.com/repos/kubernetes/kops/releases/latest | grep tag_name | cut -d '"' -f 4)/kops-darwin-amd64
+chmod +x ./kops
+sudo mv ./kops /usr/local/bin/
+```
+
+You can also rerun rerun [these steps](development/building.md) if previously built from source.
+
+## Linux
+
+From Github:
+
+```bash
+rm -rf /usr/local/bin/kops
+wget -O kops https://github.com/kubernetes/kops/releases/download/$(curl -s https://api.github.com/repos/kubernetes/kops/releases/latest | grep tag_name | cut -d '"' -f 4)/kops-linux-amd64
+chmod +x ./kops
+sudo mv ./kops /usr/local/bin/
+```
+
+You can also rerun rerun [these steps](development/building.md) if previously built from source.