v2.1.0

• adding possibility to skip pages in lists (see issue #2)
• Scan: check_xml didn't handle tags spread across multiple lines
• adding Markdown support
• re-styling the book description area
• adding classes to deal with metadata in .epub files directly, and a script to extract those
• support for more cover formats added
• some code reorg and cleanup
• cover extraction now uses new epub classes, allow for "thumbnailing"
• added possibility to auto-extract Metadata and book description from epub files. Make sure reading #4 before using this!