Clean up the name and spacing in the VersionOne code.

The VersionOne code had some spacing and trailing whitespace problems,
and also listed the service as "versionone" and not "VersionOne".
Don't show "Add comment" button if not logged in

This is for file upload reviews. Before, the button was there, but did nothing
for anonymous users. Also, fix some template tag indentation

Testing done: Checked if the button is gone for anonymous users and still there
for logged-in users. No failed tests.

Reviewed at http://reviews.reviewboard.org/r/3773/