improve garde and period models
-  fix .active scope for period
-  adding state field for garde
-  change mass create gardes to include state field
-  include garde active status in button_to_choose_garde
adding state to garde factory
multiple fixes to garde js actions
-  move holiday toggle in garde partial
-  remove create/remove garde (a garde always exists)
-  add toggle garde active/inactive state button
-  fix create/update js views
adding helper to toggle garde state field
highlight holidays dates if any garde is holiday
mass toggle holiday for gardes of a given date