Fix book.spine to flatten list; added encoding to content for Python3 #1
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I tried running this in my Python3 environment, but it wouldn't run, so I just made a few adjustments that worked for me. Basically, the *chapters was no longer expanding the chapters list, so I used itertools to flatten the list. Switching from 2 to 3 often causes encoding issues, so I just added some encoding for utf-8 when reading the files.