Added module Elm_dayselector.
Added elm_dayselector_add.
Added elm_dayselector_day_selected_set/get.
Added elm_dayselector_week/weekend_set/get.
Added elm_dayselector_weekend_length_set/get.
Added elm_dayselector_weekdays_names_set/get.
Added signals for Elm_dayselector.
Added example dayselector_example.