Add cloudformation helper scripts and a few improvements

Dockerfile

@@ -1,6 +1,8 @@
 FROM alpine:3.4
 MAINTAINER colin.hom@coreos.com
 
-RUN apk --update add bash curl less groff jq python py-pip
-RUN pip install awscli==1.11.15 s3cmd==1.6.1
-RUN mkdir /root/.aws
+RUN apk --no-cache --update add bash curl less groff jq python py-pip && \
+  pip install --no-cache-dir --upgrade pip && \
+  pip install --no-cache-dir awscli==1.11.15 s3cmd==1.6.1 https://s3.amazonaws.com/cloudformation-examples/aws-cfn-bootstrap-latest.tar.gz && \
+  apk del py-pip && \
+  mkdir /root/.aws