** Bumped version into 3.1.2-SNAPSHOT
** Replaced AbstractTransactionedServlet with @Transactional annotation
** Added isDownloadableType method into MaterialController
** Added download link into Forge materials
** Removed LAZY directive from VectorImage because it somehow maneged to
empty data column when vector images were accessed
** Fixed couple of potential NPEs from MaterialsServlet
** Added some logging into session controller session end