Added epub parser
added entities card with tooltips
filesizes weren't being calculated properly
Added book fields in the schema
improved the look of entities tags
Added google books api call to extract book information based on epub-parser data
Finished implementation of epub data extraction using epub-parser and google books api.
sha1 will now be calculated using filedata + user
removed isbn due to problems
conditional statement on thumbnails
Renamed /images/ route to /static/ to avoid conflicts with images folder
Added new buttons styles
Finished adding "boxes" on detail-text page