More robust udate of prosody modules

src/freedombone-app-xmpp

         chown -R prosody:prosody /var/lib/prosody/prosody-modules
     fi
 
-    cd /var/lib/prosody/prosody-modules
-    hg pull
-    hg update
-
     # change to using pep rather than profile modules
     if grep '"profile"' /etc/prosody/prosody.cfg.lua; then
         sed -i 's|"profile"|"pep"|g' /etc/prosody/prosody.cfg.lua