allow to login with email instead of nick as well + tests
start of making nickname optional
fix typo breaking invitation
make search work without nickname usage
more user display changes
user display changes in model and mailer
small model change
make user creation possible again
show user name with use_nick is false
beautify map invocations of users
fallback for when nick is nil
fix new user form
Merge branch 'master' into allow-no-nickname

Conflicts:
	app/views/foodcoop/users/_users.html.haml
allow plugins to modify the navigation menu
first version of the foodsoft_wiki plugin
add foodsoft_wiki plugin to Gemfile by default
move wiki functionality to plugin
fix and cleanup routing (closes foodcoops#190)
move foodsoft_wiki db migration to plugin
update foodsoft_wiki README