readme update
experimental rtl support (#209)
add bitcoin address (fix #101)
about page restyling
new label (#129)
keep text only before detecting direction, use jsoup because bidiutils html stripping is too restrictive
make sure we have content
Implemented "goto subscription".

TODO:
 * Neither navigation with arrows nor selection with ENTER implemented,
   must click a subscription.

--HG--
extra : rebase_source : 6e8bac814ffe28b75c7fe9a9c7be04647cb518bd