Add entity ResourceGroup.

Signed-off-by: Marios Sotiropoulos <mai1211@uom.edu.gr>
Load ResourceGroup data.

Signed-off-by: Marios Sotiropoulos <mai1211@uom.edu.gr>
Add method imageAction to class ClientController.

Signed-off-by: Marios Sotiropoulos <mai1211@uom.edu.gr>
Re-insert the image entitled "1".

Signed-off-by: Marios Sotiropoulos <mai1211@uom.edu.gr>
Stop URL-encoding the "access token" send by the ClientController.

Signed-off-by: Marios Sotiropoulos <mai1211@uom.edu.gr>
Return a resource via a Response object in the ResourceController::imageAction
method.

Up until now we were sending the result of the "readfile" function.

Signed-off-by: Marios Sotiropoulos <mai1211@uom.edu.gr>
Use function "rawurlencode" for URL-encoding image file names in method
ClientController::imageAction.

Signed-off-by: Marios Sotiropoulos <mai1211@uom.edu.gr>
Serve images only for GET requests from the ResourceController.

Signed-off-by: Marios Sotiropoulos <mai1211@uom.edu.gr>
Load images to the slide-show demo.

Signed-off-by: Marios Sotiropoulos <mai1211@uom.edu.gr>