Fixes issue 240

fixes those bugs :

Bug: On the book manager, the book component version number should update as soon as a source file has been uploaded. At the moment, it only updates at some point durning the 'converting' status -- this is confusing becuase it's not clear that the latest file version is converting. ***

Bug: On the book component Files tab: when I upload a new file version it does not display in the files table even after refreshing. Eventually the file does show in the table (assuming after it has been converted). Also, as soon as an individual file has been uploaded, the version number should update on the book manager page.