Ignore Tar files and GnuPG signatures

These are always downloaded on demand and never committed to the
repository.

Signed-off-by: Thomas Braun <thomas.braun@byte-physics.de>
Signed-off-by: Sebastian Schuberth <sschuberth@gmail.com>
Use multiple concurrent prove jobs to improve test speed

The absolute path referencing wmic.exe is required, as we must not rely on
the contents of $PATH outside our mingGitDevEnv world.

Signed-off-by: Thomas Braun <thomas.braun@byte-physics.de>
Merge pull request #4 from t-b/git-faster-testing

Use multiple concurrent prove jobs
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