jena-project

[Andy Seaborne]

When we moved to one version for all modules, pressure of time pushed us 
to have jena-project as a copy of the old jena-parent.

Do we want to go the next step forward which is to merge jena-project 
into the top POM and drop the jena-project module?

It turns out to be quite easy to do.

PR for discussion:
  https://github.com/apache/jena/pull/312

It does make the top POM quite large - 932 lines.

Thoughts?

    Andy