Using unicode-bidi instead of lrm

* It is less hackish than lrm but please refactor bidi-embed if needed
* lrm was making an extra space for all, so this is fixup for it
Merge pull request #417 from ebraminio/master

Fixing a bidi problem on titles
feed fetching now uses POST (fix #418)
create unique index on user_id (fix #400)
delete sample test
plugin update
fix #395
remove warnings
use title if text is empty (fix #419)