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 #321 - delete otr fingerprints
Merge branch 'development' of github.com:siacs/Conversations into development
warn on missing presence subscription
don't fail displayed or received messages
settings to force encryption and setting for not saving messages to disk. fixed #353
fixed sending offline pgp messages
bug fixes for forcing encryption
introduced downloadable interface. reverted some of the changes made to OTR
simplefied some code that might have been the source for some strange bugs
bumped openpgp-api to version 5
hide encryption settings under 'expert options'
setting to increase font size. fixed #420
don't reset images from sending to waiting
Merge branch 'master' of github.com:siacs/Conversations

Conflicts:
	src/eu/siacs/conversations/crypto/PgpEngine.java
	src/eu/siacs/conversations/persistance/FileBackend.java
	src/eu/siacs/conversations/ui/ShareWithActivity.java