Include correct ivy jar version to match libraries.properties

ivy/libraries.properties used to contain:
```
ivy.version=2.0.0-rc2
```

This has been changed to:
```
ivy.version=2.2.0
```

However, the the ivy directory still contains the file: ```ivy/ivy-2.0.0-rc2.jar```. Ant downloads the correct version as needed. Since the old version is never used, it seems like it should be replaced with the 2.2.0 version.