Use signed in, signed out to describe whether the DB is open or closed.

Hopefully this gives users a better understanding of whether their
messages and contacts are accessible than "Briar is running" and "Quit".

briar-android/res/values/strings.xml

 <?xml version="1.0" encoding="utf-8"?>
 <resources>
     <string name="app_name">Briar</string>
-    <string name="ongoing_notification_title">Briar is running</string>
+    <string name="ongoing_notification_title">Signed into Briar</string>
     <string name="ongoing_notification_text">Touch to show the dashboard.</string>
     <string name="setup_title">Briar Setup</string>
     <string name="choose_nickname">Choose your nickname:</string>
@@ -21,7 +21,7 @@
     <string name="contact_list_button">Contacts</string>
     <string name="forums_button">Forums</string>
     <string name="synchronize_button">Synchronize</string>
-    <string name="quit_button">Quit</string>
+    <string name="sign_out_button">Sign Out</string>
     <string name="new_identity_item">New identity\u2026</string>
     <string name="contact_list_title">Contacts</string>
     <string name="contact_connected">Connected</string>

briar-android/src/org/briarproject/android/BriarActivity.java

@@ -67,7 +67,7 @@ public class BriarActivity extends RoboFragmentActivity {
 		if(bound) unbindService(serviceConnection);
 	}
 
-	protected void quit() {
+	protected void signOut() {
 		new Thread() {
 			@Override
 			public void run() {

briar-android/src/org/briarproject/android/DashboardActivity.java

@@ -135,19 +135,19 @@ public class DashboardActivity extends BriarActivity {
 		});
 		buttons.add(syncButton);
 
-		Button quitButton = new Button(this);
-		quitButton.setLayoutParams(matchMatch);
-		quitButton.setBackgroundResource(0);
-		quitButton.setCompoundDrawablesWithIntrinsicBounds(0,
+		Button signOutButton = new Button(this);
+		signOutButton.setLayoutParams(matchMatch);
+		signOutButton.setBackgroundResource(0);
+		signOutButton.setCompoundDrawablesWithIntrinsicBounds(0,
 				R.drawable.device_access_accounts, 0, 0);
-		quitButton.setText(R.string.quit_button);
-		quitButton.setOnClickListener(new OnClickListener() {
+		signOutButton.setText(R.string.sign_out_button);
+		signOutButton.setOnClickListener(new OnClickListener() {
 			public void onClick(View view) {
 				showSpinner();
-				quit();
+				signOut();
 			}
 		});
-		buttons.add(quitButton);
+		buttons.add(signOutButton);
 
 		int pad = LayoutUtils.getPadding(this);