Merge pull request #220 from GuillaumeGomez/master

change Account::getUsers for Account::getDisconnectedUsers
directories named "local" changed to "locale".
Merge pull request #210 from regnarock/fix/locale_dir_name

Fixed typo in some directories name
add locale + new error handling for Market
fix locales path ( broken after change of folder naming: local -> locale)
Form system include now an autogen constructor to wrap assignation
add  forgotten error string to market cart widget
Remove trash comment and unneecessary import
Update documentation
Update 01-howto.md
Merge pull request #222 from jeremyletang/market-refactor

implements locales system + error handling on Market module
Update 01-howto.md

Correct mistakes
Merge pull request #223 from ValentinTrinque/form-enhancement

Form system include now an autogen constructor to wrap assignation
Port of mail module to last beluga version
Clean source code
Update mail module
Port of news module