Fixed bugs in heartbeat and other things

app/src/main/java/de/kuschku/libquassel/BusProvider.java

app/src/main/java/de/kuschku/libquassel/CoreConnection.java

app/src/main/java/de/kuschku/libquassel/ProtocolHandler.java

...assel/functions/serializers/HeartbeatReplySerializer.java

...libquassel/functions/serializers/HeartbeatSerializer.java

.../libquassel/localtypes/backlogmanagers/BacklogFilter.java

...main/java/de/kuschku/libquassel/protocols/LegacyPeer.java

...n/java/de/kuschku/libquassel/ssl/QuasselTrustManager.java

...schku/quasseldroid_ng/service/ClientBackgroundThread.java

...java/de/kuschku/quasseldroid_ng/ui/chat/ChatActivity.java