MUMUP-1260: Separate marketplace apps by ability to launch

Implements a div right below the filter tabs that contains a checkbox to 'Show all' portlets, including the portlets they do not have access to. By default the user will only be shown portlets that they do have access to. There is a question mark icon next to 'Show all' that displays our desired help text in a tooltip upon hover.

I used a custom filter to do this, which can be found with the Unicon developer's filter in filters.js.

Cool thing: That div I implemented was looking pretty bare on the left side, so I added some dynamic text that shows the user how many portlets are being displayed at that moment, out of how many. We had talked about this possibly being helpful for giving the user a frame of reference for how many apps were on the page, both total and after their various filter queries. 

![image](https://cloud.githubusercontent.com/assets/1919535/4852742/f054b7e8-607e-11e4-8538-286a7d00c05d.png)

Here it is in action (thanks to @timlevett for the inspiration to put gifs in here):

![screencast](http://f.cl.ly/items/3G2s2m3W390D341r0G0p/Screen%20Recording%202014-10-30%20at%2004.48%20PM.gif)