Update Commons-Http to newest version of Apache HttpClient-4 (4.3 beta).

Enable HTTP 1.1 for Commons-Http with HttpClient 4. This fix improved
the performance by almost 100% (not that it is great... just that it is
better now :)

Provide helper methods for Java Persistence API (JPA) at Commons-Persistence.

Remove dependencies to OpenJPA from Commons-Persistence. The only dependency
it to the API now (its another module or the application dute to select
a proper JPA implementation).

Change Commons-Persistence JPA dependency to one provided by EclipseLink,
version 2.1. It's sad that Sun/Oracle doesn't provide an official package,
but, fortunately, EclipseLink's one is pretty fair.

Remove Hibernate related stuff from Commons-Persistence into a new
module.

Remove MySQL related stuff from Commons-Persistence into a new
module.
Move modules from within 'parent' directory to the root (where they
really belong to).

Add files from Commons-Persistence-Hibernate and Commons-Persistence-MySQL
(they were missing from the last patch).
Update 'commons-http' to work with newer version of HttpClient 4.x.