events: Output the event that is leaking

Signed-off-by: Fedor Indutny <fedor@indutny.com>
configure: better detect windows 'bitness' (WOW64)

Signed-off-by: Fedor Indutny <fedor@indutny.com>
docs: highlight shell-codes in CONTRIBUTING.md

Signed-off-by: Fedor Indutny <fedor@indutny.com>
Merge remote-tracking branch 'upstream/master'