fix(quickstart): remove references to downgrade

also make changes to always reference the system requirements docs for
the latest compatible versions.

Author: Matthew Fisher

src/quickstart/provider/aws/boot.md

@@ -34,12 +34,12 @@ $ mkdir my-first-cluster
 $ cd my-first-cluster
 ```
 
-Download Kubernetes release v1.2.4, and extract the archive on your machine.
+See [Kubernetes Versions](https://deis.com/docs/workflow/installing-workflow/system-requirements/#kubernetes-versions) under System Requirements and download a Kubernetes release that is compatible with Deis Workflow, and extract the archive on your machine.
 
-This archive has everything that you need to launch Kubernetes. It weighs in around 500MB, so it may take some time to download:
+This archive has everything that you need to launch Kubernetes. It's a fairly large archive, so it may take some time to download:
 
 ```
-$ curl -sSL https://storage.googleapis.com/kubernetes-release/release/v1.2.4/kubernetes.tar.gz -O
+$ curl -sSL https://storage.googleapis.com/kubernetes-release/release/v1.3.5/kubernetes.tar.gz -O
 $ tar -xvzf kubernetes.tar.gz
 $ cd kubernetes
 $ ls

src/quickstart/provider/gke/boot.md

@@ -38,7 +38,7 @@ Click "Create" and Google Container Engine will provision your cluster. The proc
 
 ![](images/gke-node-version.jpg)]
 
-After the cluster is created, check the node version. If you are on 1.3.x, **downgrade the node version to 1.2.5**. See [Kubernetes Versions](https://deis.com/docs/workflow/installing-workflow/system-requirements/#kubernetes-versions) under System Requirements for more details.
+After the cluster is created, check the node version. See [Kubernetes Versions](https://deis.com/docs/workflow/installing-workflow/system-requirements/#kubernetes-versions) under System Requirements for more details.
 
 ## Install and configure the Google Cloud CLI
 

src/quickstart/provider/vagrant/boot.md

@@ -22,12 +22,12 @@ $ mkdir my-first-cluster
 $ cd my-first-cluster
 ```
 
-Download Kubernetes release v1.2.4, and extract the archive on your machine.
+See [Kubernetes Versions](https://deis.com/docs/workflow/installing-workflow/system-requirements/#kubernetes-versions) under System Requirements and download a Kubernetes release that is compatible with Deis Workflow, and extract the archive on your machine.
 
-This archive has everything that you need to launch Kubernetes. It weighs in around 500MB, so it may take some time to download:
+This archive has everything that you need to launch Kubernetes. It's a fairly large archive, so it may take some time to download:
 
 ```
-$ curl -sSL https://storage.googleapis.com/kubernetes-release/release/v1.2.4/kubernetes.tar.gz -O
+$ curl -sSL https://storage.googleapis.com/kubernetes-release/release/v1.3.5/kubernetes.tar.gz -O
 $ tar -xvzf kubernetes.tar.gz
 $ cd kubernetes
 $ ls