FLUID-3822: Pager demo: Patch for sortable columns

[Cheetham, Anastasia]

[I tried to send this message to the list last night, but it doesn't seem to have shown up. If you end up getting it twice, sorry...]

I've attached a patch to FLUID-3822 which implements sortable columns in the Pager demo:
    http://issues.fluidproject.org/browse/FLUID-3822
It's just a first pass, there are still some changes to be made, but I wanted to get it out there (plus I was working from home, so I wanted it accessible from the office today).

1) The columnDefs object is hard-coded. This should be changed to be programmatically generated.

2) In modifying the HTML, I noticed that the demo uses rsf:ids - this needs to be removed!

3) Jon, there is still no affordance whatsoever that some of the columns are sortable. The mock-up shows the arrows, so we'll have to add those. If this is going to be done through a CSS class, we can add the class programmatically using the 'sortableHeader' and 'unsortableHeader' decorators (e.g. using a jQuery "addClass" decorator, perhaps).

-- 
Anastasia Cheetham     Inclusive Design Research Centre
acheetham at ocad.ca            Inclusive Design Institute
                                        OCAD University