Remove old bootstrap script
Enable logging via commons-logging in wagon-p2

This is useful to get logging from dependencies such as httpclient in
Maven.
Make the EMF test project compilable/executable again
Fix an issue in the EMF test code
Use a more meaningful ID for the Kepler release repository
Remove generated files
Various improvements of the P2 wagon provider

* Thread safety.
* Error handling.
* Support for resourceExists.
* On the fly generation of POM files.
First version of the emf-maven-plugin