[ci skip] Add badges to stack READMEs

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all-spark-notebook/README.md

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 # Jupyter Notebook Python, Scala, R, Spark, Mesos Stack
 
 ## What it Gives You
@@ -195,7 +197,7 @@ rdd.sum()
 
 Connection to Spark Cluster on Standalone Mode requires the following set of steps:
 
-0. Verify that the docker image (check the Dockerfile) and the Spark Cluster which is being deployed, run the same version of Spark. 
+0. Verify that the docker image (check the Dockerfile) and the Spark Cluster which is being deployed, run the same version of Spark.
 1. [Deploy Spark on Standalone Mode](http://spark.apache.org/docs/latest/spark-standalone.html).
 2. Run the Docker container with `--net=host` in a location that is network addressable by all of your Spark workers. (This is a [Spark networking requirement](http://spark.apache.org/docs/latest/cluster-overview.html#components).)
     * NOTE: When using `--net=host`, you must also use the flags `--pid=host -e TINI_SUBREAPER=true`. See https://github.com/jupyter/docker-stacks/issues/64 for details.

datascience-notebook/README.md

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 # Jupyter Notebook Data Science Stack
 
 ## What it Gives You

minimal-kernel/README.md

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 # Kernel Gateway Stack
 
 ## What it Gives You

minimal-notebook/README.md

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 # Minimal Jupyter Notebook Stack
 
 ## What it Gives You

pyspark-notebook/README.md

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 # Jupyter Notebook Python, Spark, Mesos Stack
 
 ## What it Gives You

r-notebook/README.md

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 # Jupyter Notebook R Stack
 
 ## What it Gives You

scipy-notebook/README.md

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 # Jupyter Notebook Scientific Python Stack
 
 ## What it Gives You