Add a Community Projects page

Author: velvia

docs/_layouts/global.html

@@ -111,6 +111,7 @@
                                 <li class="divider"></li>
                                 <li><a href="building-with-maven.html">Building Spark with Maven</a></li>
                                 <li><a href="https://cwiki.apache.org/confluence/display/SPARK/Contributing+to+Spark">Contributing to Spark</a></li>
+                                <li><a href="community-projects.html">Community Projects</a></li>
                             </ul>
                         </li>
                     </ul>
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+                            displayMath: [ ["$$","$$"], ["\\[", "\\]"] ],
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docs/community-projects.md

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+---
+layout: global
+title: Community Projects
+---
+
+Here is a list of Spark projects contributed by the community.  If you have an interesting project, submit a pull request to add it here!
+
+# Spark Infrastructure
+
+* [Spark Job Server](https://github.com/spark-jobserver/spark-jobserver): A REST service for submitting, managing, and tracking multiple Spark jobs.
+
+# Spark Data Sources
+

docs/index.md

@@ -105,6 +105,7 @@ options for deployment:
 * [3<sup>rd</sup> Party Hadoop Distributions](hadoop-third-party-distributions.html): using common Hadoop distributions
 * [Building Spark with Maven](building-with-maven.html): build Spark using the Maven system
 * [Contributing to Spark](https://cwiki.apache.org/confluence/display/SPARK/Contributing+to+Spark)
+* [Community Projects](community-projects.html): third party Spark projects
 
 **External Resources:**