Road to next release

[sagotch]

• Make generated modules optionals (currently, you have both default module using Eliom_content and S module producing string. In order to make it useful for any application and not only ocsigen's ones.
• Have built-in type support (e.g., {{x:int}} should produce f ~x -> "Foo :" ^ (string_of_int x)
• New syntax: maybe using less brackets (3 brackets for optionnal args...), avoiding the need of else case if empty like in {{{c?hey||}}}.