Bug fixes

HasQuotedKeywords changes its regex to not be greedy.

CorrelateSections#correlate_all returns nil so as not to spam the
command line

Parsable changes error_report to not use @errors and instead use
self.errors.
Changes Area#errors

Instead of adding to Area's @errors variable, verify_all just runs
parse on each section and stops there. Calls to Area#errors will then
grab all of the sections' errors, add it to the area's errors, and
return that. It won't modify Area's @errors.

(correlate_all still gets assigns to the @errors variable; that's how
Area has any at all.)