Added GPL-3, AGPL-3, LGPL-3.

File contents taken from the official GNU documentation at
http://www.gnu.org/licenses/gpl-howto.html, changed to reflect the
current project (${project.name}) instead of 'Foobar'.

Signed-off-by: Sebastian Hoß <mail@shoss.de>
Added WTFPL.

File contents taken from http://www.wtfpl.net/faq/.

Signed-off-by: Sebastian Hoß <mail@shoss.de>
Added 4-clause BSD, 3-clause BSD and 2-clause BSD license.

File contents taken from http://en.wikipedia.org/wiki/BSD_licenses

Signed-off-by: Sebastian Hoß <mail@shoss.de>