Add-ons containg Java code should be packaged as AMPs

[GoogleCodeExporter]

As discussed in issue 77, JAR files are easily installed into shared/lib but 
this does not work for add-ons containing Java classes.

A better alternative would be to build an AMP file containing the JAR, so it 
can be more easily deployed into WEB-INF/lib.

Ideally the JAR containing the Java code would be separate from the JAR 
containing the config. Web-tier stuff should also be separated out into a 
different project from the repo stuff.

Original issue reported on code.google.com by will.abson on 27 Jun 2012 at 2:11