Added new Spark versions to manual.

docs/_manual/experiments-definitions.md

@@ -113,6 +113,9 @@ The `peel-extensions` module ships with several *System* implementations. The fo
 | MapReduce        | 2.4.1          | mapred-2.4.1    |
 | Spark            | 1.3.1          | spark-1.3.1     |
 | Spark            | 1.4.0          | spark-1.4.0     |
+| Spark            | 1.5.1          | spark-1.5.1     |
+| Spark            | 1.5.2          | spark-1.5.2     |
+| Spark            | 1.6.0          | spark-1.6.0     |
 | Zookeeper        | 3.4.5          | zookeeper-3.4.5 |
 | Dstat            | 0.7.2          | dstat-0.7.2     |
 
@@ -701,4 +704,4 @@ Similar to the *System* beans, the definitions of the *DataSet*, *Experiment*, a
 * [`config/fixtures/wordcount.xml`](https://github.com/stratosphere/peel-wordcount/blob/master/peel-wordcount-bundle/src/main/resources/config/fixtures/wordcount.xml) and  
 * [`config/fixtures/wordcount.scala`](https://github.com/stratosphere/peel-wordcount/blob/master/peel-wordcount-bundle/src/main/resources/config/fixtures/wordcount.scala).   
 
-The full configuration as initialized in your `peel-wordcount` bundle [can be found in the GitHub repository](https://github.com/stratosphere/peel-wordcount/blob/master/peel-wordcount-bundle/src/main/resources/config).
+The full configuration as initialized in your `peel-wordcount` bundle [can be found in the GitHub repository](https://github.com/stratosphere/peel-wordcount/blob/master/peel-wordcount-bundle/src/main/resources/config).