Added Headers to HTTPReply()
Access-Control-Allow-Origin: Access-Control-Allow-Headers:
Specify the origin with new command line option -rpcorigin defaults to localhost only.
These headers are needed for make RPC requests from a browser. More info: https://developer.mozilla.org/en/http_access_control
Use cases are apps such as https://chrome.google.com/webstore/detail/ablfbfgmgfoggdhhcnledndibdihggpb and a feature I would like to implement for https://blockchain.info/wallet/