Merge pull request #1381 from Bash-it/feature/gcloud-completion

Add Google Cloud SDK tab completion

completion/available/gcloud.completion.bash

@@ -0,0 +1,9 @@
+#/usr/bin/env bash
+# Bash completion for Google Cloud SDK
+
+if which gcloud >/dev/null 2>&1; then
+  GOOGLE_SDK_ROOT=${GOOGLE_SDK_ROOT:-$(gcloud info --format="value(installation.sdk_root)")}
+  for i in $(ls ${GOOGLE_SDK_ROOT}/*.bash.inc); do
+    source $i
+  done
+fi