Added SelfInjectingServerResource and module

SelfInjectingServerResource is an alternative to
FinderFactory/RestletGuice.

Also added some JUnit tests.
Add README for Guice extension
Add links to blog entries on injection approaches
Provide links in README.md to classes involved
Update incubator/org.restlet.ext.guice/README.md
Merge pull request #710 from Tembrel/guice-integration

Guice integration update