Add notes for how to get pages from amazon and barnes and noble

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+final img urls look like:
+http://sitb-images.amazon.com/Qffs+v35lepeP2icY2OteGGgTPZO7sxgfhv6+rCKfpWLrJyvNAksvFu4WzV79TodydVXgzoaP3o=
+http://sitb-images.amazon.com/Qffs+v35lepeP2icY2OteGGgTPZO7sxgsXoL4TS0WgsVOflj1z8cVkwoGTF8uqsrBObiKx03xck=
+
+ugly, but need no cookie, and can be re-downloaded
+
+feature is called variously 'search inside this book' ('sitb') or 'look inside this book' ('litb')
+
+
+http://www.amazon.com/gp/reader/0140442278/ is reader link, but appears to just redirect back to book link, with js pre-opened
+
+sitb js library (not very obfuscated):
+http://z-ecx.images-amazon.com/images/G/01/digital/sitb/reader/v4/201010271203/sitb-library-js._V176048133_.js
+
+
+loadBookData looks promising - does ajax method:"getBookData",asin:asin - line 4903. this uses the SITB_READER_AJAX_URL. http://www.amazon.com/gp/search-inside/service-data?method=getBookData&asin=0140442278
+
+some page urls are contained in that. under the title 'litbPages', e.g. 'look inside the book'. other ajax calls are definitely the place to look; follow usage of AJAX_URL and jquery.ajax
+
+* note: https works :)
+
+the main book data only contains the initial pages linked to from sidebar; others are available from the interface by using next/prev buttons, or by scrolling. investigate the ajax calls further
+
+getSBData gives more metadata, not relevant here
+
+goToPage gives lots of good stuff (line 2972); page requested plus nearby ones. official arg requests use a 'token', but seem to be able to get away without one
+
+http://www.amazon.com/gp/search-inside/service-data?method=goToPage&asin=0140442278&page=27
+
+not all pages are available; if not, we get this (still a 200, mind):
+
+{"error":{"text":{"key":"PAGE_NOT_AVAILABLE_TEXT"},"title":{"key":"PAGE_NOT_AVAILABL
+E_TITLE"},"reftag":"rdr_bar_view"}}