Deprecated ActionMailer attribute :sent_on

Using the new mailer API, you can specify :date to the mail method.
More information:
http://stackoverflow.com/questions/7367185/weird-error-when-delivering-mail-undefined-method-index-for-2011-09-09-2215
check for group profile when loading wiki

Groups may not have a profile. in that case they also do not have a wiki.

In the setters we make use of profiles.public and profiles.private which
create the corresponding profile.
remove deprecated remote_form and link_to_remote

Haven't been able to remove all of them yet. In particular the page search stuff is heavily based on them
minor: RAILS_DEFAULT_LOGGER -> Rails.logger

also fixed a typo in test helpers
deprecated: find(:first, ...) and the like replaced
Merge pull request #54 from azul/upgrade/rails3-deprecations

Upgrade/rails3 deprecations