Merge pull request #168 from strb/mucicons

Fix tile rendering for larger conferences
added warning when public keys are missing
unified crypto messages and made lock icon work for conferences
changed roster to concurrent hashmap
linked openkeychain install dialog from decrypt messages box
updated changelog and readme for the 0.3 release
version bump
Fixed typo in source "sefl" -> "self"
Merge pull request #169 from alethea/self-typo

Fixed typo in source
long press on images revails share with intent
Merge branch 'development' of github.com:siacs/Conversations into development
added pgp sig on muc rename
version bump to 0.3
small type
Merge pull request #176 from imaginator/patch-1

small typo
answer to xep 184 message receipts. fixes #95
Merge branch 'feature/xep-0333' into development
fixed pgp on incoming carbon messages
more bug fixes for the pgp problem
received and displayed messages (xep 333) are now marked properly