Updated NetworkConnection to use gzip compression when available (see https://developers.google.com/books/docs/v1/performance)
Updated NetworkConnection to use gzip compression when available (see https://developers.google.com/books/docs/v1/performance)

getbookshelf/bookshelf-server,getbookshelf/bookshelf-server,getbookshelf/bookshelf-server,getbookshelf/bookshelf-server