Add capability to list all permissions

[westlakem]

I should warn I'm fairly new to the concept of promises (usually just use callbacks).

I could use some assistance with this as I'm not sure how the promises are used when they come out of the service.

If I do a PermissionService.getAllPermissions.then(function(result) {console.log(result)}) on the first ok.then call, it prints the correct information, but I am not sure if that is the desired output. So I added the 2nd ok.then on top of it to only return the relative information (model the permission is on, the role associated, and action allowed). I for some reason can't get it to return the collection in my console when I do PermissionService.getAllPermissions, and I'm not sure what I'm doing wrong.

This is a pull request because I feel there should be a way for admins to see what permissions have been granted to what roles easily.