add background view
better handling metadata defaults model values
better handling object model defaults values
better handling screen model defaults values
bug fix. addresses #54
bug fix. addresses #54
improve robustness when checking version
remove useless log and replace log by debug
catch and log exception in case of error
Ajout objet background
add background view
add background view
Better debug message ; delete dupplicate method
html templates for different views to show objects
Views to show initial filmstrip'screns objects
display background image in backbround view
introducing model for actions, adding it to the new dahu output files
create model for mouse object
introducing model for tooltip objects

Conflicts:
	dahu/core/app/scripts/models/objects/mouse.js
create requestResponse module

The requestResponse module is used for decoupling Backbone and
Backbone.Marionette application modules regarding Request/Response
pattern.