Changed com.clearspring.analytics stream version from 2.4.0 to 2.5.1 to match SBT build, and added pyrolite to maven build

Author: ahirreddy

pom.xml

@@ -262,7 +262,12 @@
       <dependency>
         <groupId>com.clearspring.analytics</groupId>
         <artifactId>stream</artifactId>
-        <version>2.4.0</version>
+        <version>2.5.1</version>
+      </dependency>
+      <dependency>
+        <groupId>org.spark-project</groupId>
+        <artifactId>pyrolite</artifactId>
+        <version>2.0</version>
       </dependency>
       <!-- In theory we need not directly depend on protobuf since Spark does not directly
            use it. However, when building with Hadoop/YARN 2.2 Maven doesn't correctly bump