distribution does not include the avocado jar files

Hello,

I'm trying to create a distribution of Avocado using
```
mvn clean package -DskipTests -P distribution
```
but the distribution files in `avocado/avocado-distribution/target` do not contain the jar file. 

I tried the `avocado-distribution_2.11-0.1.0-bin.tar.gz` distribution from sonatype and it doesn't have the jar file either.

Thanks
Pradeep