Fix #38 and fix compatibility with calibre-web #40
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This PR fixes #38 and fixes compatibility with calibre-web by making a couple checks against the feed optional. I haven't tested it super thoroughly so I don't know if any other checks need to be fixed but I added fallback values in case a feed doesn't have the "server" or "updated" keys present.
A couple tips in case anyone in the future is reading this and struggling to get calibre-web to play nicely with the plugin:
http://url-of-server/opds/books
then select "All" in the dropdown and press Download OPDS. This grabs the full library (limits may exist, unsure) in alphabetical order.