update C13 install-bx-cli.sh script to better support OSX

Chapter13/install-bx-cli.sh

@@ -4,14 +4,8 @@
 
 function install_CLI ()
 {
-    showStep "installing cloud Foundry CLI"
-    wget -q -O - https://packages.cloudfoundry.org/debian/cli.cloudfoundry.org.key | sudo apt-key add -
-    echo "deb https://packages.cloudfoundry.org/debian stable main" | sudo tee /etc/apt/sources.list.d/cloudfoundry-cli.list
-    sudo apt-get update
-    sudo apt-get install cf-cli
-
-    showStep "Installing BM Cloud (Bluemix) CLI"
-    curl -fsSL https://clis.ng.bluemix.net/install/linux | sh
+    showStep "installing Ubuntu or OSX cloud Foundry CLI"
+    curl -sL http://ibm.biz/idt-installer | bash
 
     showStep "Getting list of uninstalled IBM Cloud CLI Packages"
     PACKAGE_LIST=($(bluemix plugin repo-plugins -r Bluemix | grep "Not Installed" | awk '{print $3}'))
@@ -26,12 +20,12 @@ function install_CLI ()
 
 function install_kubectl
 {
-    showstep "Retrieving Ubuntu or OSX kubectl"
-        if [[ $OS == "Darwin" ]]; then
-        echo "updating for OSX"
+    showStep "Retrieving Ubuntu or OSX kubectl"
+    if [[ $OS == "Darwin" ]] || [[ $OS == "darwin" ]]; then
+        echo "updating kubectl for OSX"
         curl -LO https://storage.googleapis.com/kubernetes-release/release/`curl -s https://storage.googleapis.com/kubernetes-release/release/stable.txt`/bin/darwin/amd64/kubectl
     else
-        echo "updating for Linux"
+        echo "updating kubectl for Linux"
         curl -LO https://storage.googleapis.com/kubernetes-release/release/$(curl -s https://storage.googleapis.com/kubernetes-release/release/stable.txt)/bin/linux/amd64/kubectl
     fi