I added those because otherwise, Maven 3 on Java 7 complains:

```
[ERROR] Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:2.0.2:compile (default-compile) on project cdh4-extras: Compilation failure: Compilation failure:
[ERROR] /home/dchen/Projects/Impala2/thirdparty/cdh4-extras/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/scheduler/fair/AllocationConfiguration.java:[40,3] error: annotations are not supported in -source 1.3
```

I will change the version to 2.3.