Yarn improvements

Implementation for issue https://github.com/stratosphere/stratosphere/issues/473

The new tar.gz file has the following structure:
```
./examples
./examples/stratosphere-java-examples-0.5-SNAPSHOT-EnumTrianglesWithDegrees.jar
./examples/stratosphere-java-examples-0.5-SNAPSHOT-WebLogAnalysis.jar
./examples/stratosphere-java-examples-0.5-SNAPSHOT-EnumTrianglesOnEdgesWithDegrees.jar
./examples/stratosphere-scala-examples-0.5-SNAPSHOT-ConnectedComponents.jar
./examples/stratosphere-scala-examples-0.5-SNAPSHOT-TPCHQuery3.jar
./examples/stratosphere-scala-examples-0.5-SNAPSHOT-WordCount.jar
./examples/stratosphere-scala-examples-0.5-SNAPSHOT-KMeansForTest.jar
./examples/stratosphere-java-examples-0.5-SNAPSHOT-TPCHQuery3.jar
./examples/stratosphere-scala-examples-0.5-SNAPSHOT-KMeans.jar
./examples/stratosphere-java-examples-0.5-SNAPSHOT-DanglingPageRank.jar
./examples/stratosphere-java-examples-0.5-SNAPSHOT-ConnectedComponents.jar
./examples/stratosphere-java-examples-0.5-SNAPSHOT-KMeansIterative.jar
./examples/stratosphere-java-examples-0.5-SNAPSHOT-TeraSort.jar
./examples/stratosphere-scala-examples-0.5-SNAPSHOT-ComputeEdgeDegrees.jar
./examples/stratosphere-java-examples-0.5-SNAPSHOT-PairwiseSP.jar
./examples/stratosphere-java-examples-0.5-SNAPSHOT-EnumTrianglesRdfFoaf.jar
./examples/stratosphere-scala-examples-0.5-SNAPSHOT-EnumTrianglesOnEdgesWithDegrees.jar
./examples/stratosphere-java-examples-0.5-SNAPSHOT-WordCount.jar
./examples/stratosphere-java-examples-0.5-SNAPSHOT-KMeans.jar
./.version.properties
./tools
./tools/planVisualizer.html
./conf
./conf/log4j.properties
./conf/stratosphere-conf.yaml
./LICENSE.txt
./NOTICE.txt
./README.txt
./bin
./bin/config.sh
./bin/yarn-session.sh
./bin/stratosphere
./log
./lib
./lib/stratosphere-dist-0.5-SNAPSHOT-yarn-uberjar.jar
```

I will test this in the AWS Cloud and update the blog post.