Three new courses and a downloads page

We just added three new courses to the repository:

- Internent Technolgoies II (BSc. course on server side technologies)
- ECESIS- Java Programming with Eclipse 3.0
- ECESIS- Two Day Plugin Development with Eclipse 3.0

(the latter two are from the Eclipse ECESIS project http://www.eclipse.org/ecesis/\)

We have also added a downloads page for eacy access to the Content Packages available (see http://www.burrokeet.org/downloads/packages.html\)