Fixed error when defining background scripts.

Signed-off-by: Shwetank Dixit <emailshwetank@gmail.com>
Another fix for event page

Signed-off-by: Shwetank Dixit <emailshwetank@gmail.com>
Mentioned about cookie sharing (lack of requirement in new system)

Signed-off-by: Shwetank Dixit <emailshwetank@gmail.com>
Merge pull request #42 from shwetank/master

Fixes to architecture overview article