Sessions object

The sessions object provides a set of methods to handle persistent data associated to a set of HTTP request coming from the same source. Sessions can be used to store any kind of information in memory.

Comments: Duda sessions are stored into /dev/shm, yes, we know that is not expected as the main purpose of /dev/shm is for process intercommunication and we are breaking the rule. Mount a filesystem before launch the service is an extra step, do that inside Duda will generate permission issues.. so ?, we use /dev/shm.