Avatars for the dev-team members

[Kermit]

To all dev-team members:

As asked by RatS, I made the new avatars for the dev-team members and
they've been silently approved by Ephigenie and HenrikS

Dev members could find them here.

Please, update your avatar if you're members of the dev team so we could
be easily identified by visitors who need help and/or information!

Thank you!