Fixed text mail displaying html entities

using method found on
http://stackoverflow.com/questions/11756304/rails-escapes-html-in-my-plain-text-mails/11763211#11763211
Added unicorn to Gemfile in order to use it on deploy
Merge branch 'text_mails'

in order to send clean mail notifications
Merge branch 'notify_users'
Merge branch 'notify_users'
Send commenters notification in French

These branch would probably never be merged in upstream, configuring for
personnal usage.
Merge branch 'notify_users'
Fixed UTF8 error
Turned MOD_ADLER from const to var, since IE doesn't support 'const'
Merge pull request #52 from olafure/master

Turned MOD_ADLER from const to var, since IE doesn't support 'const'
Merge remote-tracking branch 'upstream/master'
Merge branch 'master' of github.com:bobmaerten/juvia