Added handling of $sitekey exceptions

manifest.json

 {
   "manifest_version": 2,
   "name": "__MSG_name__",
   "version": "1.2",
   "minimum_chrome_version": "20.0",
   "description": "__MSG_description__",
   "default_locale": "en",
   "update_url": "https://adblockplus.org/devbuilds/adblockpluschrome/updates.xml",
   "page_action": {
     "default_icon": "icons/abp-19.png",
     "default_title": "Adblock Plus",
     "default_popup": "popup.html"
   },
   "icons": {
     "16": "icons/abp-16.png",
     "32": "icons/abp-32.png",
     "48": "icons/abp-48.png",
     "128": "icons/abp-128.png"
   },
   "permissions": [
     "tabs", "http://*/*", "https://*/*", "contextMenus", "webRequest", "webRequestBlocking", "unlimitedStorage"
   ],
   "background": {
     "scripts": [
       "lib/adblockplus_compat.js", "lib/adblockplus.js", "lib/punycode.js",
-      "lib/publicSuffixList.js", "lib/basedomain.js", "webrequest.js",
-      "background.js"
+      "lib/publicSuffixList.js", "lib/basedomain.js", "lib/sha1.js",
+      "lib/jsbn.js", "lib/rsa.js", "webrequest.js", "background.js"
     ]
   },
   "options_page": "options.html",
   "content_scripts": [
     {
       "matches": ["http://*/*", "https://*/*"],
       "js": ["include.preload.js"],
       "run_at": "document_start",
       "all_frames": true
     },
     {
       "matches": ["http://*/*", "https://*/*"],
       "js": ["include.postload.js", "include.textads.js"],
       "run_at": "document_end",
       "all_frames": true
     }
   ],
   "web_accessible_resources": ["block.html"]
 }