text messages: save read/notified state

ring-android/app/src/main/AndroidManifest.xml

...pp/src/main/java/cx/ring/adapters/ContactPictureTask.java

...pp/src/main/java/cx/ring/client/ConversationActivity.java

...oid/app/src/main/java/cx/ring/history/DatabaseHelper.java

...droid/app/src/main/java/cx/ring/history/HistoryEntry.java

...oid/app/src/main/java/cx/ring/history/HistoryManager.java

...ndroid/app/src/main/java/cx/ring/history/HistoryText.java

...oid/app/src/main/java/cx/ring/loaders/ContactsLoader.java

...android/app/src/main/java/cx/ring/model/Conversation.java

...-android/app/src/main/java/cx/ring/model/TextMessage.java

...droid/app/src/main/java/cx/ring/service/LocalService.java