Simplification: Removing Eba_sigs and Eba_config to make modules more independants
Simplification: Removing Eba_default to make modules more independant
Simplification: moving several modules from template to lib.
Removing useless module PROJECT_NAME_tools.eliom
Registration of Eba services is now done in lib
Clean up in template directory
Small clening of eba_request_cache
Adding module Eba_tips (tips for beginners and new features)