Complete rewrite to add likes

This commit replaces the icon with a SVG and adds the possibility
to like pages too. To do this the whole structure was rewritten
which makes it in the future easier to add new functions.

manifest.json

@@ -1,21 +1,17 @@
 {
-
-    "description": "Indie Reply Button",
+    "description": "Button to like and reply",
     "manifest_version": 2,
-    "name": "indie-reply-button",
-    "version": "1.0",
-    
-    "background": {
-        "scripts": ["background.js"]
+    "name": "Indie Reply Button",
+    "version": "2.0",
+    "icons": {
+        "48": "icons/icon.svg"
     },
-    
     "browser_action": {
-        "default_icon": {
-            "16": "icons/icon-16.png",
-            "32": "icons/icon-32.png"
-        }
+        "default_icon": "icons/icon.svg",
+        "default_title": "IndieButton",
+        "default_popup": "popup.html",
+        "browser_style": false
     },
-    
     "permissions": [
         "tabs"
     ]