Typo fix
exclude everything under config from tarball
debian/install: install backends as well
tools/gen-fake-data.sh: fix to work on wheezy

the version of faketime in wheezy does not support `+0days`
extra safety: add `set -u` to all shell scripts
don't blame dependencies when package itself was updated
Make test suite independent of the source tree

This allows running the test suite agains the installed package, that
is, debci will now be able to have its own test suite run on
ci.debian.net :)
Prepare 0.5.0 release
minimine test dependencies to catch missing ones in the package itself