/jenkins/README.md is not sync with /jenkins/makefile

[javiersanp]

The readme says:

## Rebuild without blowing away local data

1. make stop
2. make clean
3. make build
4. make run

But the makefile doesn't content the clean target. It does clean-data and clean-images, so I suppose that make clean should be make clean-data.

Also:

## Rebuild AND blow away local data

1. make stop
2. make clean-data
3. make build
4. make run

That I suppose should be make clean-images instead of make clean-data.

[maxfields2000]

Ah Good catch, I'll get this fixed asap.