[3.8] Add bin/setup doc, remove old commands

This is related to alchemy-fr/Phraseanet#333
Add doc about bin/setup check:system exit codes
Here is a fix for issue #59 posted by romainneutron
Images for Devel
Merge pull request #60 from anthonycabot/master

[3.7] Fix english application developer documentation
Add fork me on github ribbon
Phraseanet Developer documentation enhancement
Merge pull request #62 from romainneutron/fork

[3.7] Add fork me on github ribbon
Fix fork url
Améliorations des descriptions d'authentification
Add a reference in user manual
Address @anthonycabot comments
Merge pull request #61 from romainneutron/api

[3.7] Phraseanet Developer documentation enhancement
Fix typo
Merge pull request #63 from romainneutron/typo

[3.7] Fix typo
Bump to version 3.8
Address @anthonycabot comments
Fix #30 : Add archive task configuration example
Merge pull request #49 from romainneutron/configuration-tester

[3.8] Add bin/setup doc, remove old commands
[3.8] Add search engine documentation