Ability to parse global result attributes. This right now means only
the total number of results as reported by Scholar at the top of the
results pages (e.g. "About 31 results"). Such global result attributes
end up in the new attrs member of the used ScholarQuery class. To
render those attributes, you need to use the new --txt-globals flag.
See README for an example.

Thanks to John Bohannon for the suggestion.