Merge remote-tracking branch 'upstream/master'
fbpost: using the same text formatting functionality like other addons
fbpost: Preparation for answering to facebook posts that come through the facebook sync addon
        don't mirror posts that are wall postings
fbsync: First commit for syncing the facebook newsfeed
fbpost: Setting the extid only when it is no toplevel post. (important for fbsync)
fbsync: Code reworked. Still not ready.
fbsync: Setup for creating users is ready
Merge pull request #159 from annando/master

Facebook sync