[Crawl-ref-discuss] Welcome Aidan Holm to the team!

[Neil M. <ne...@s-...>]

Aidan Holm (aidanh on IRC, aidanholm on github) has been making many
excellent contributions, especially (but not only) regarding the SDL
tiles port and the menu system.  He has in a few short months already
become the de facto expert on our SDL tiles interface.

Aidan has agreed to join the team so that maybe he doesn't completely
dominate the list of unmerged pull requests :) Everyone give him a warm
welcome!

-- 
Neil Moore, crawl-dev, ne...@s-..., ne...@cs...