Switch to source format "3.0 (quilt)"

Nothing really changes due that move as we don't carry any patches currently.

But this gets us some nice goodies like automatic exclusion of the
.git directory and being able to have symlinks in the debian
directory.
Move debian directory to root directory
Add permanent symlinks for init.d, default and logrotate files
Add changelog entry with non-native version

Use 0.3+dev as upstream version for now
Ignore some files when building the Debian source package

These files are in the git repo, but not included in the tar ball
build by setup.py sdist. This allows building the source package
directly from the git repository instead of just the unpacked tar
ball.