when adding coauthors in the "go_xpost_save_post" hook, be sure to use the user nicename of the local user, and only call add_coauthors() if we have coauthors to add.

see https://github.com/GigaOM/legacy-pro/issues/2045
code sniffer happiness
Merge pull request #23 from wluo/github-2045

Finding Janko('s posts)!
set the first param of register_deactivation_hook() to the correct plugin file
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arrrgh
Merge pull request #24 from wluo/github-3534

fixed an incorrect parameter for register_deactivation_hook()
added documentation for functions
Added php comments
Added php comments
Added more function documentation