Update device metadata.

apple-ipad-1-2-mini/device.json

@@ -1,7 +1,9 @@
 {
   "show-by-default": false, 
   "modes": [], 
-  "title": "Apple iPad 1 / 2 / iPad Mini", 
+
+  "//": "iPad (1st generation), iPad 2, iPad Mini (1st generation),  have same device characteristics",
+  "title": "Apple iPad Mini", 
   "screen": {
     "horizontal": {
       "width": 768, 

apple-ipad-3-4/device.json

@@ -1,7 +1,10 @@
 {
   "show-by-default": false, 
   "modes": [], 
-  "title": "Apple iPad 3 / 4", 
+
+  "//": "iPad (3rd generation), iPad (4th generation), iPad Air, iPad Air 2 have same display",
+  "title": "Apple iPad", 
+  
   "screen": {
     "horizontal": {
       "width": 768, 

apple-iphone-5/device.json

@@ -1,7 +1,10 @@
 {
   "show-by-default": false, 
   "modes": [], 
+
+  "//" : "iPhone 5, iPhone 5S, iPhone 5c have identical display & screen characteristics",
   "title": "Apple iPhone 5", 
+  
   "screen": {
     "horizontal": {
       "width": 568, 

google-nexus-7-2/device.json

@@ -1,7 +1,7 @@
 {
   "show-by-default": false, 
   "modes": [], 
-  "title": "Google Nexus 7 2", 
+  "title": "Google Nexus 7", 
   "screen": {
     "horizontal": {
       "width": 600, 

google-nexus-7/device.json

@@ -1,7 +1,7 @@
 {
   "show-by-default": false, 
   "modes": [], 
-  "title": "Google Nexus 7", 
+  "title": "Google Nexus 7 (1st gen)", 
   "screen": {
     "horizontal": {
       "width": 604,