Removed crash at exiting in progressbar_example.
Added module Elm_slideshow.
Added elm_slideshow_add.
Added Elm_Slideshow_Item_Class.
Added elm_slideshow_item_add.
Added elm_slideshow_item_show.
Added elm_slideshow_next/previous.
Added elm_slideshow_transition(s)_set/get.
Added elm_slideshow_timeout_set/get.
Added elm_slideshow_loop_set/get.
Added elm_slideshow_clear.
Added elm_slideshow_items_get.
Added elm_slideshow_item_current_get.
Added elm_slideshow_item_object_get.
Added elm_slideshow_item_nth_get.
Added elm_slideshow_layout(s)_set/get.
Added elm_slideshow_cache_before/after_set/get.
Added elm_slideshow_count_get.
Added signals of Elm_slideshow.
Updated README.