mozharness 0.5

A lot's happened since mozharness 0.4 landed in late September. We:

• added a bunch of Android native support.
• enabled Android single locale repacks with nightly update snippet generation
• ported Android signing with passphrase verification, signature verification, single locale support, and update snippet creation.
• rolled peptest out to production on Try, across all desktop test platforms.
• improved mozharness virtualenv support, with real-life mozbase usage in peptest.
• fixed actions-in-config-files.
• separated the output parser from ShellMixin.run_command(), so we can
• parse output from subprocess or get_output_from_command(),
• eventually add context lines to output parsing, and
• potentially split serial tasks into multiple parallel jobs with their own log parsing.
• added chunking support to split up jobs across machines.
• added query_exe() and which() support to specify or find executables.
• added add_failure(), query_failure(), and summarize_success_count() support to track granular status across a list of tasks.
• added a BuildbotMixin and ReleaseMixin to tie into our existing buildbot infrastructure/configs.
• precompiled the error_list regexes.
• made various OSMixin and ShellMixin method improvements.
• added a setup.py.
• added a pyflakes call and Debian/Ubuntu support to unit.sh.
• moved mozilla-specific modules into mozharness.mozilla.*.
• retired Maemo scripts (Maemo tier 3).

This feels like an as-good-as-any time to arbitrarily increment the arbitrary version number: mozharness 0.5.

I think the best part of this release is how more people got involved; I can feel the momentum building. I certainly don't want to wait another 5 months before the next arbitrary version bump.