Allow dashes in usernames
Changes for 1.009
Fixes in CONTRIBUTING.pod

Fix typo in NAME section.
Add "FOR RELEASE MANAGER" section.
release.pl: make a build tag instead of a real release

If the current branch is not 'devel', create a build tag (named with the
branch name followed by '.build') instead of a real release.
This can help contributors who want to build a release just for testing.
Bump version to 1.009
release.pl: build from 'HEAD' instead of 'devel'

This should simplify work for contributors as they are expected to work
on branches, not directly on 'devel'.
Release v1.009