Update manifest with required permissions

Remove unneeded storage,tabs permissions
Update host to matching schemes. Thanks to @kst164
This allows extension to be hidden on non-AIMS websites

Part of:
#5

Fixes:
#38

manifest.json

@@ -1,7 +1,7 @@
 {
     "manifest_version": 2,
     "name": "AIMS-Helper",
-    "version": "0.1",
+    "version": "0.6",
     "background": {
       "scripts": ["/src/bg/background.js"],
       "persistent":false
@@ -10,10 +10,10 @@
       "default_popup":"/src/popup/popup.html"
     },
     "content_security_policy":"script-src 'self' https://www.gstatic.com/ https://*.firebaseio.com https://www.googleapis.com https://apis.google.com; object-src 'self'",
-    "permissions": ["declarativeContent", "storage", "tabs", "<all_urls>","http://*/","https://*/", "identity"],
+    "permissions": ["declarativeContent", "*://aims.iith.ac.in/*/"],
     "key": "MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEArxDKyZq24tbgpEHXZLVG29XWoSQ+5i0EE7SAmylQeFNtynjLnvZLJPUwvjzQt+qQugYXuIzUhFqPgGBFOtXkMuiAsKtysYZelj1RUgJ6T5TLMBMYE71I97YuhSV6j6q4vSlX/3dCq8tRSrqfDCNIDtnnD8l8IslrBLJz69bVhFSX70Xt4rWsX4PQ6K+mTTTPvX3ZN87czyqWTyyp+vcTLdEqGHfqUNJ/Y05r6lghTJXLfSy3NvtlbYHm+nT/AU2JVojXCfR29lU9hVbJl9cGMgIKSUS1Ee9ON+Y1SM0xM82/1eknoSO9X+CYbHf+M5ZH0kaPBTUfLEa2yuwr+pakrQIDAQAB",
     "oauth2": {
       "client_id": "198169856520-3hh3ri82ptmvb3oqdvhvh9mui0ldo5c1.apps.googleusercontent.com",
       "scopes":["https://www.googleapis.com/auth/datastore"]
     }
-}
+}