Update readme.txt

Issue https://github.com/ciubotaru/share-on-diaspora/issues/34 fixed now.
Update new_window.php

Issue https://github.com/ciubotaru/share-on-diaspora/issues/33 should be fixed now.
Podlist update
Update pod_list_all.php
Update readme.txt
added hover text to the button
changed the podlist file format to plain text, one pod per line
Updated the list of pods

...  based on podupti.me stats, sorted by number of registered users, keeping joindiaspora.org (it's not in the stats, though live and kicking).
Moving inline styles to css file
updated version number to 0.5.2 and created a new tag subdirectory
Merge pull request #36 from ciubotaru/unstable

Unstable