fixed #403
rotate avatars

Conflicts:
	src/eu/siacs/conversations/persistance/FileBackend.java
fixed #406
fixed pgp signature creation
more openpgp bug fixes
set openpgp-api-lib to a version that actually works
fixed #342 - otr with facebook and other services without resources
improved logging for avatar fetches
warn user if no presence subscription exists
MUC: set password from invite message.
Merge pull request #422 from betheg/muc_password

MUC: set password from invite message.
made otr a little bit more solid when there is no presence subscription
Merge branch 'development' of github.com:siacs/Conversations into development
added recent contributors
readme formating
fixed npe
added missing breaks oO
made shareing text with conferences possible again
MUC: set the password from bookmarks.
Merge pull request #424 from betheg/bookmark_password

MUC: set the password from bookmarks.