#19 Editable grid modifications: templates, view models, js; + using editable grid in blog -> authors
#18 Finished editable grid inline editor saving
#18 Created template for selecting image in the authors grid
#18 Authors: refactored table, modified get / save commands; created view model with image;
#18 Finished logics of selecting an image for an author in the grid;
#18 Browsing image for author javascript modifications
#18 Created required attribute extender;