Fixes: nodejs#131 Show Title and name in header if narrowed to self PM's

Author: kunall17

app/src/main/java/com/zulip/android/filters/NarrowFilterPM.java

@@ -74,7 +74,7 @@ public boolean matches(Message msg) {
     public String getTitle() {
         ArrayList<String> names = new ArrayList<>();
         for (Person person : people) {
-            if (!person.equals(ZulipApp.get().getYou())) {
+            if (!person.equals(ZulipApp.get().getYou()) || people.size() == 1) { //If PM to self then show title as your name
                 names.add(person.getName());
             }
         }

app/src/main/java/com/zulip/android/models/Message.java

@@ -231,7 +231,7 @@ public void setRecipient(String[] emails) {
 
     /**
      * Constructs a pretty-printable-to-the-user string consisting of the names
-     * of all of the participants in the message, minus you.
+     * of all of the participants in the message.
      * <p/>
      * For MessageType.STREAM_MESSAGE, return the stream name instead.
      *
@@ -246,14 +246,15 @@ public String getDisplayRecipient(ZulipApp app) {
             ArrayList<String> names = new ArrayList<>();
 
             for (Person person : people) {
-                if (person.id != app.getYou().id) {
+                if (person.id != app.getYou().id || people.length == 1) {
                     names.add(person.getName());
                 }
             }
             return TextUtils.join(", ", names);
         }
     }
 
+
     /**
      * Creates a comma-separated String of the email addressed of all the
      * recipients of the message, as would be suitable to place in the compose