SAMZA-1408 update the branch doc for 0.13.1 release

Author: Fred Ji <haifeng.ji@gmail.com>

Reviewers: Yi Pan <nickpan47@gmail.com>

Closes #286 from fredji97/0.13.1_doc and squashes the following commits:

0717974 [Fred Ji] SAMZA-1408 keep the doc unchanged for minor release and update PR based on feedback
774ee5f [Fred Ji] SAMZA-1408 update the branch doc for 0.13.1 release
diff --git a/docs/_config.yml b/docs/_config.yml
index d81ecac..3efef96 100644
--- a/docs/_config.yml
+++ b/docs/_config.yml
@@ -23,6 +23,6 @@
   extensions: ['with_toc_data', 'smart']
 exclude: [_docs]
 baseurl: http://samza.apache.org
-version: latest
+version: '0.13'
 # this is the version you will go if you click 'switch version' in "latest" pages.
 latest-release: '0.13'
diff --git a/docs/learn/tutorials/versioned/hello-samza-high-level-code.md b/docs/learn/tutorials/versioned/hello-samza-high-level-code.md
index 6c0526e..bde3dee 100644
--- a/docs/learn/tutorials/versioned/hello-samza-high-level-code.md
+++ b/docs/learn/tutorials/versioned/hello-samza-high-level-code.md
@@ -32,7 +32,6 @@
 {% highlight bash %}
 git clone https://git.apache.org/samza-hello-samza.git hello-samza
 cd hello-samza
-git checkout latest
 {% endhighlight %}
 
 This project already contains implementations of the wikipedia application using both the low-level task API and the high-level API. The low-level task implementations are in the `samza.examples.wikipedia.task` package. The high-level application implementation is in the `samza.examples.wikipedia.application` package.
diff --git a/docs/learn/tutorials/versioned/hello-samza-high-level-yarn.md b/docs/learn/tutorials/versioned/hello-samza-high-level-yarn.md
index 5108099..4ece13d 100644
--- a/docs/learn/tutorials/versioned/hello-samza-high-level-yarn.md
+++ b/docs/learn/tutorials/versioned/hello-samza-high-level-yarn.md
@@ -29,7 +29,6 @@
 {% highlight bash %}
 git clone https://git.apache.org/samza-hello-samza.git hello-samza
 cd hello-samza
-git checkout latest
 {% endhighlight %}
 
 This project contains everything you'll need to run your first Samza application.
@@ -63,7 +62,7 @@
 {% highlight bash %}
 mvn clean package
 mkdir -p deploy/samza
-tar -xvf ./target/hello-samza-0.13.1-SNAPSHOT-dist.tar.gz -C deploy/samza
+tar -xvf ./target/hello-samza-0.13.1-dist.tar.gz -C deploy/samza
 {% endhighlight %}
 
 ### Run a Samza Application
diff --git a/docs/learn/tutorials/versioned/hello-samza-high-level-zk.md b/docs/learn/tutorials/versioned/hello-samza-high-level-zk.md
index bc0da6e..65a48d3 100644
--- a/docs/learn/tutorials/versioned/hello-samza-high-level-zk.md
+++ b/docs/learn/tutorials/versioned/hello-samza-high-level-zk.md
@@ -29,7 +29,6 @@
 {% highlight bash %}
 git clone https://git.apache.org/samza-hello-samza.git hello-samza
 cd hello-samza
-git checkout latest
 {% endhighlight %}
 
 The project comes up with numerous examples and for this tutorial, we will pick the Wikipedia application.
@@ -59,7 +58,7 @@
 {% highlight bash %}
 mvn clean package
 mkdir -p deploy/samza
-tar -xvf ./target/hello-samza-0.13.1-SNAPSHOT-dist.tar.gz -C deploy/samza
+tar -xvf ./target/hello-samza-0.13.1-dist.tar.gz -C deploy/samza
 {% endhighlight %}
 
 We are now all set to deploy the application locally.
diff --git a/docs/learn/tutorials/versioned/samza-rest-getting-started.md b/docs/learn/tutorials/versioned/samza-rest-getting-started.md
index 1459893..243b629 100644
--- a/docs/learn/tutorials/versioned/samza-rest-getting-started.md
+++ b/docs/learn/tutorials/versioned/samza-rest-getting-started.md
@@ -48,7 +48,7 @@
 {% highlight bash %}
 cd samza-rest/build/distributions/
 mkdir -p deploy/samza-rest
-tar -xvf ./samza-rest-0.13.1-SNAPSHOT.tgz -C deploy/samza-rest
+tar -xvf ./samza-rest-0.13.1.tgz -C deploy/samza-rest
 {% endhighlight %}
 
 #### Configure the Installations Path
diff --git a/docs/startup/hello-samza/versioned/index.md b/docs/startup/hello-samza/versioned/index.md
index aab0ff5..b5b0533 100644
--- a/docs/startup/hello-samza/versioned/index.md
+++ b/docs/startup/hello-samza/versioned/index.md
@@ -27,7 +27,6 @@
 {% highlight bash %}
 git clone https://git.apache.org/samza-hello-samza.git hello-samza
 cd hello-samza
-git checkout latest
 {% endhighlight %}
 
 This project contains everything you'll need to run your first Samza jobs.
@@ -61,7 +60,7 @@
 {% highlight bash %}
 mvn clean package
 mkdir -p deploy/samza
-tar -xvf ./target/hello-samza-0.13.1-SNAPSHOT-dist.tar.gz -C deploy/samza
+tar -xvf ./target/hello-samza-0.13.1-dist.tar.gz -C deploy/samza
 {% endhighlight %}
 
 ### Run a Samza Job