fixed some stuff to make this work for me 

ok, so nate's code wasn't working for me, so here's a bunch of stuff i
did to make it work for @latourliturgies

* merged in some changes that jacob harris made since nate forked his
project (htmlentities, blank tweet protection)

* there was some stuff that ebook.rb needs that wasn't specified in
twitter_init.rb so i added it

* commented some stuff in ebook.rb that had been confusing to me

* added some debugging code to the tweet generation in ebook.rb so it's
clear what is being scraped from which account

* made two accounts the default configuration (since otherwise i figured you'd just use jacob harris's code)

i'm pretty sure these changes are helpful, but i'm not sure if i'm
contributing them in a helpful way, since this is my first time trying
to contribute to someone else's code on github. apologies in advance!