add pod with discussions from mailing list to the home page
allow users to add an email address
update profile with email when from github
send user to edit his profile when missing email, see #90
add possibility to pospose/enquire a topic, closes #89
generalize mailing list stuff for all groups, but less present
Merge pull request #95 from phoet/proposals

add possibility to pospose/enquire a topic
Merge pull request #94 from phoet/thomet-add_pod_for_mailing_list_to_home

Thomet add pod for mailing list to home
also add email to typus admin
update a lot of gems
update humans.txt
remove UTF8 magic comments
cleanup some spec
remove host
reformat yaml
remove extension
automate the process of creating new usergroups
automatically add participants by adding proposals, closes #96
validate the length of an url
add some ids for anchoring