Adding BSD License text

Google code's page for original source state it was released under BSD License.
I wasn't able to identify author name, nor copyright date
initial version from https://code.google.com/p/cookie-txt-export/
remove unneeded files and make it work on Chrome 26.0.1410.64 m (manifest_version 2)
added hostname and ip domain support
Prevents XSS

Patch from https://code.google.com/p/cookie-txt-export/issues/detail?id=1
fixed 2nd level domain not support issue.
see http://mxr.mozilla.org/mozilla-central/source/netwerk/dns/effective_tld_names.dat?raw=1
Automatic synchronization with publicsuffix.org

* Added automatic downlod of effective_tld_names.dat from publicsuffix.org to remove manual action
* Automatically and directly update src/domain_list.js
* Using variable to hold file names to make the code more readable
* Removing unnecessary files
Syncing with publicsuffix.org

* Updating domain_list.js with latest available data
* Storing effective_tld_names.dat as cache. It could be removed on a later stage
Adding readme
Updating first line

the first line of the file needs to match rexep
#( Netscape)? HTTP Cookie File
Adding headers

to help reading cookies
Adding license