SPARK-1729. Make Flume pull data from source, rather than the current push model

Fix build with maven.

Author: harishreedharan

external/flume/pom.xml

@@ -77,6 +77,7 @@
     <dependency>
       <groupId>org.apache.spark</groupId>
       <artifactId>spark-streaming-flume-sink_2.10</artifactId>
+      <version>${project.version}</version>
     </dependency>
   </dependencies>
   <build>