Support multiple related readings.

[mlv]

One thing that would be really useful here is the ability to chain related readings. For example, if I did:

kjv.extract("Matt 23:37-39,24:1-14")
I'd like it to return:
[(u'Matthew', 23, 37, 23, 39), (u'Matthew', 24, 1, 24, 14)]

(Actually, since Matt 23 ends at 39, better would be
[(u'Matthew', 23, 37, 24, 14)]

Right now, it ignores the 24:1-14 as it doesn't begin with a book name. I'd like it to remember the previous book name and if a book name (or chapter) is missing, assume it from the previous one.

Best would be:
kjv.extract("Matt 22,23:1-14,18,35-39,24:1-14,18")
returning
[(u'Matthew', 22, 1, 23, 14), (u'Matthew', 23, 18, 23, 18), (u'Matthew', 23, 35, 24, 14), (u'Matthew', 24, 18, 24, 18)]

I'd be happy if it required them to be consecutive. I wouldn't expect:
kjv.extract("If you look at Matt 23:10-14, you'll see one of the 15 occurrence of the word 'hypocrite'")
to give ('Matthew', '23, 10, 23, 15)

Maybe this could be a different method than extract?