Publish and fetch a modular jar to a repository

[Paul Sandoz]

Hi,

Here is a webrev to support the publishing and fetching of modular jars from a repository:

  http://cr.openjdk.java.net/~psandoz/jigsaw/repo-add-jar/webrev/

I resisted the temptation to make too many changes since I think this area will need to go through a significant redesign to generalize the storage of stuff on the repository (src, docs etc) and be extensible to support stuff like reverse indexes and provide a sprinkling of REST on the HTTP repository.

So it just adds the feature with minimal fuss.

I hacked the testing in rather quickly, it perhaps could be improved with some guidance or feedback.

Paul.