storage: predefined ACL support #177
Description
While using storage api I didn't find any option about predefined acl value. It seems that we need to patch the getWritableStream_ function inside lib/storage/index.js to customize the qs object, like, adding something like "predefinedAcl: option.acl"
This might also need a change to the API to accept an extra option parameter so we can do things like this:
bucket.write(filename, {data: buf, option: {predefinedAcl: 'publicRead'}}, function() { ... });