* examples/hildon-pannable-area-example-4.c, (main): Modified the name of the hindica...

* examples/hildon-pannable-area-example-4.c, (main): Modified the name of the hindicator_mode to hscrollbar_visible

* src/hildon-pannable-area.c,
	(hildon_pannable_area_class_init),
	(hildon_pannable_area_motion_notify_cb),
	(hildon_pannable_area_size_allocate): Reviewed the drawing logic,
	we have reduced the amount of signals and managed reviewed its
	rationale. Changed the default decelerate value.

	(hildon_pannable_area_add),
	(hildon_pannable_area_redraw): Refactored functions.

	(hildon_pannable_area_init),
	(hildon_pannable_area_get_property),
	(hildon_pannable_area_set_property):
	(hildon_pannable_draw_vscroll),
	(hildon_pannable_draw_hscroll),
	(hildon_pannable_area_initial_effect),
	(hildon_pannable_area_expose_event),
	(hildon_pannable_area_scroll),
	(hildon_pannable_area_button_press_cb),
	(hildon_pannable_area_realize): Replaced the names hindicator_mode
	and vindicator_mode with hscrollbar_policy and
	vscrollbar_policy. Replaced hscroll and vscroll with
	hscroll_visible and vscroll_visible.

	(hildon_pannable_area_refresh): Refactor the function, remove
	variables and check the calls to this function, added resize
	conditions in case the children change their layout.

	(hildon_pannable_area_size_request): Added more detailed
	size_request calculation.