fix up RoomSettings somewhat and implement room colors

src/Tinter.js

@@ -126,6 +126,11 @@ module.exports = {
             cached = true;
         }
 
+        if (!primaryColor) {
+            primaryColor = "#76CFA6"; // Vector green
+            secondaryColor = "#EAF5F0"; // Vector light green
+        }
+
         if (!secondaryColor) {
             var x = 0.16; // average weighting factor calculated from vector green & light green
             var rgb = hexToRgb(primaryColor);
@@ -145,6 +150,13 @@ module.exports = {
             tertiaryColor = rgbToHex(rgb1);
         }
 
+        if (colors[0] === primaryColor &&
+            colors[1] === secondaryColor &&
+            colors[2] === tertiaryColor)
+        {
+            return;
+        }
+
         colors = [primaryColor, secondaryColor, tertiaryColor];
 
         // go through manually fixing up the stylesheets.