Add support for OSGi containers to discover and install Ceylon modules.

[luolong]

Since ceylon/ceylon-compiler#1456 has added OSGi meta-data support to Ceylon modules, we need a way to enable OSGi containers to discover and deploy Ceylon modules as OSGi bundles.

From the top of my head, I see two approaches (they do not need to be mutually exclusive):

• Write a Ceylon runtime implementation for OSGi container (something of the sort has been implemented for Maven repository artifact discovery in Apache Felix)
• Produce/provide OBR and/or p2 repository metadata in Herd and local repository, so that OSGi containers can access them natively.

[alesj]

Last item looks like it could nicely solve both, #87 and #88.
Where for #87 would simply read-off the import info from MANIFEST.MF.

[alesj]

But I guess this means we would have to stick to Require-Bundle usage?

[FroMage]

Moving to 1.2, unfortunately.