added contributors and note to xep65
Fix two typos: assoziated -> associated.
Fix typo: Preemptivly -> Preemptively.
Merge pull request #58 from jelmer/fix-typo-assoziated

Fix two typos: assoziated -> associated.
Merge pull request #59 from jelmer/typo-preemptively

Fix typo: Preemptivly -> Preemptively.
tried to fix some race conditions. not adding duplicate candidates. needs more checks though
added very basic, very untested gui on the receiving side
made ui with sending images a little smoother
jingle sessions now get terminated proberly on success
added clear history dialog (no funcionality)
fixed possible race conditions with presences
fixed #63
fixed destination bug
put more string into strings.xml
lot of cleanup in jingle part
work around for bug in xmlpullparser
Merge branch 'master' into development
updated minidns
tried to avoid some more race conditions in jingle
Refactored unknown contact picture generation

Introduce drawTile method in order to remove code duplication