** Splitted BookPublication file property into downlodableFile and
printableFile properties
** Renamed BookPublicationFileDAO into PublicationFileDAO
** Added .gitignore for SchemaExporter
** Added type parameter support into PublicationFileServlet post request
handling. Parameter specifies which file is updated on the request
** Added support for deleting, creating and updating of publication
files into PublicationController
** Added support for uploading both printable and downloadable files
into publication management
** Removed purchasable and requiresDelivery properties from Publication 
** Removed downloadable property from BookPublication 
** Changed publication management icons
** Changed management view to work without removed properties
** Fixed a bug in game library publication lists which allowed add to
shopping cart and download free pdf links to appear even when functions
in question were not actually available