Included port of candy bookmarks pluggins

I could not find the right pluggin in strophe, so I made one based on
the one from candy.
Remove irrelevant namespace from message bodies

Fixes https://github.com/candy-chat/candy/issues/311
Merge pull request #49 from flosse/master

updated joap plugin
Merge remote-tracking branch 'benlangfeld/patch-1' into patch-1
recompiled muc plugin
Merge pull request #51 from flosse/patch-1

recompiled muc plugin
Merge pull request #43 from ernestochaves/master

Included port of candy bookmarks pluggins
fixed type checking in '_convertToXML' method
Merge remote-tracking branch 'upstream/master'