Sortable columns in OSP Portfolio tool

Aaron asked to create a series of sub-tasks for this issue. The sortable Portfolio would be a good first step. The patch included works as a start, but I had included previous comments about some issues we had with that resolution. To resummarize here:

1) The "default" ordering seems to be reversed by name (starting with Z names and going to A's). That seems odd.

2) Portfolios that I have created are now sorted into the mix rather than being listed at the top of the list. This needs to be handled somehow – maybe a filter to only show portfolios I created, or another sort field or something.

3) When sorting by Owner it seems to use the first name rather than the last.

4) It'd be nice to have the control over how many portfolios to display on a single page, similar to Resources or other tools.