Updated versions of extensions + new extensions

Added: Scroll to Bottom, Outbox
Updated: audio_downloader, blacklist, bookmarker, jk_across_pages,
mass_plus, one_click_reply, soft_refresh, tweaks, xinbox,
xkit_preferences
Merge branch 'master' of https://github.com/atesh/XKit

Conflicts:
	Extensions/scroll_to_bottom.icon.js
	Extensions/scroll_to_bottom.js