Add Category/Subcategory Parameter specification to Coregistration

[khaled]

Add the ability to provide a category or subcategory to an offer to use generally when displaying offers.

[khaled]

When parameters from a category or subcategory are added to an offer's list of parameters they are now used preferentially to display the offer specifically on a video watch page (/content/video/watch/xxxxxx)

The basic drilldown is:

1. First, any Offer that matches the page parameters exactly (i.e. watch/100007/).

2. Second, the home subcategory for the page content is retrieved and any Offers that match the subcategory (i.e. /cid/6/sid/9/9) are used.

3. Third, the home category for the page content is used and any Offers that match the category (i.e. /cid/6/) are used.

If more than the number needed for the page are returned from within a selection, they are randomized and use the Probability weight. So if 3 different offers share a category, the selection of which to use for a content page with that category is randomized and the probability weight is applied.

Any offer that has been accepted already or rejected is excluded from this selection.