changed conversation listing method...

- made the requestRepliesAfter function recursive
- displayed replies indented (something like #153)
- changed maxExpandPost value to 8
- added conversation modal to show all post in a conversation...
- added Symbola.ttf for possible missing unicode symboles..
integrated calm theme adaptation
more calm theme css adaptation
grabed copy to clipboard functions from Calm client for Tox and Bitmessage address
Merge pull request #155 from erqan/conversations

changed conversation listing method...