Session Creation should be optional

Currently, PicoServletContainerFilter forces use of a session. To me, this isn't necessarily a good practice for high scaling systems.

As far as I can see, there are a few things that should happen with this:

1 - We split things up into two filters. One that creates the session container, and one that creates the request. This would allow Session Nazi's to bypass the session container altogether.

2 - We do some sort of lazy initialization so if we have:

pico.as(WebCharateristics.SESSION).addComponent(MyObject.class);

Then when:

//No Session
assert  request.getSession(false) == null;

pico.getComponent(MyObject.class);

//Session Created
assert request.getSession(false) != null;