process-package: fix handling of shell opts
not about this release to unstable
schroot: re-add gnupg home to adt-run command line
blame: fix compatibility with Ruby 1.9 from wheezy
debci: pass --force parameter when using parallel as well
debci-test: don't second guess the wrapper script
debci-status: fix compatibility with Ruby 1.9 from wheezy
process-package: check for previous dependency change before using it
Add missing dctrl-tools dependency
Use "dpkg --print-architecture" instead of dpkg-architecture

This avoids a dependency on dpkg-dev and the (undeclared) dependency on gcc,
which previously was producing tons of warnings:

  dpkg-architecture: warning: couldn't determine gcc system type, falling back
  to default (native compilation)

Also fix grep_packages in lib/functions.sh to actually use the configured
instead of the host architecture.
Add --help output to debci-{list-packages,setup,test}

Instead of failing with

  bin/debci-test: 78: [...]/debci/lib/environment.sh: usage: not found
adjust changelog as 0.5.0 was not uploaded yet