[SHRINKDESC-110] Support Portlet 2.0

[jerr]

This is a first implemetation of portlet descriptor.

This isn't a full javaee spec but it's bassed on javaee 1.4, tell me if I can leave the code in the javaee projects (api and impl).
Moreover, I modified the portlet-app_2_0.xsd to add the xsd: namespace. If you prefer no modification, I can provide a patch for the maven plugin to accept tags without xsd: namespace.

Jeremie.

[ALRubinger]

Hi Jeremie:

Thanks!

Would you mind filling out: https://cla.jboss.org/index.seam

...?

S,
ALR

[ALRubinger]

Upstream: 0bbedd9

[ALRubinger]

Jeremie:

I've added this as-is, but I'd like to consider it not yet fully
complete (for Alpha it's OK).

As you note, changes were necessary to the XSD; we should instead aim
to leave these unaffected. Would you please open a separate issue to
fix this? And would you like to take a stab at the fix as well?

S,
ALR