Added opengraph_author_object filter hook on the author object

- Some white space changes for consistency with the rest of the file.

Part 1 of a solution for:
GigaOM/gigaom#4904

See also:
https://github.com/GigaOM/gigaom-plugins/pull/2879
If we're not generically filtering `the_queried_object`, then we should probably name the filter with plugin-specific prefixes. How's `bsocial-opengraph-author` work for you?