Make lastN configurable, max, and lock. Fixes #225

app/public/config/config.example.js

@@ -1,9 +1,9 @@
 // eslint-disable-next-line
 var config =
 {
-	loginEnabled     : false,
-	developmentPort  : 3443,
-	productionPort   : 443,
+	loginEnabled    : false,
+	developmentPort : 3443,
+	productionPort  : 443,
 
 	/**
 	 * If defaultResolution is set, it will override user settings when joining:
@@ -25,6 +25,7 @@ var config =
 		{ scaleResolutionDownBy: 2 },
 		{ scaleResolutionDownBy: 1 }
 	],
+
 	/**
 	 * White listing browsers that support audio output device selection.
 	 * It is not yet fully implemented in Firefox.
@@ -43,6 +44,10 @@ var config =
 	},
 	lastN       : 4,
 	mobileLastN : 1,
+	// Highest number of speakers user can select
+	maxLastN    : 5,
+	// If truthy, users can NOT change number of speakers visible
+	lockLastN   : false,
 	background  : 'images/background.jpg',
 	// Add file and uncomment for adding logo to appbar
 	// logo       : 'images/logo.svg',