Add changelog entries for #5006 & #5009 [ci skip]
XMPP diaspora chat feature

open tasks:
* mixed content; writing reverse proxy for rails application?!
* design tweaks (smiles are broken)
* login with user credentials from external (authentication works; something else broken?!)
* pod federation (was not tested yet)
* make jappix text translatable
* history / offline messages (we probably want that?!)

Vines is located here zauberstuhl/diaspora-vines
Jappix is located here zauberstuhl/bower-jappix-mini
Removed obsolete files and configured default values