[FLINK-1065] [streaming] Explicitly adding commons-math dependency

DEPENDENCIES

@@ -16,6 +16,7 @@ under the Apache License (v 2.0):
  - Apache Commons CLI (http://commons.apache.org/cli/)
  - Apache Commons FileUpload (http://commons.apache.org/fileupload/)
  - Apache Commons IO (http://commons.apache.org/io/)
+ - Apache Commons Math (http://commons.apache.org/proper/commons-math/)
  - Apache Log4J (http://logging.apache.org/log4j/1.2/)
  - Apache Avro (http://avro.apache.org)
  - Apache Hadoop (http://hadoop.apache.org)

flink-addons/flink-streaming/flink-streaming-core/pom.xml

@@ -42,6 +42,12 @@ under the License.
 			<version>2.0.6</version>
 		</dependency>
 
+		<dependency>
+			<groupId>org.apache.commons</groupId>
+			<artifactId>commons-math</artifactId>
+			<version>2.2</version>
+        </dependency>
+
 	</dependencies>
 
 	<build>

flink-dist/src/main/flink-bin/LICENSE

@@ -223,6 +223,7 @@ under the Apache License (v 2.0):
  - Apache Commons CLI (http://commons.apache.org/cli/)
  - Apache Commons FileUpload (http://commons.apache.org/fileupload/)
  - Apache Commons IO (http://commons.apache.org/io/)
+ - Apache Commons Math (http://commons.apache.org/proper/commons-math/)
  - Apache Log4J (http://logging.apache.org/log4j/1.2/)
  - Apache Avro (http://avro.apache.org)
  - Apache Hadoop (http://hadoop.apache.org)

pom.xml

@@ -84,7 +84,7 @@ under the License.
 			<artifactId>commons-lang3</artifactId>
 			<version>3.1</version>
 		</dependency>
-		
+
 		<dependency>
 			<groupId>commons-logging</groupId>
 			<artifactId>commons-logging</artifactId>