Consistent sorting functions about ampersand-collection

[wraithgar]

subcollection is being deprecated, see AmpersandJS/ampersand-subcollection#43

This doesn't change this issue, just where you should be looking as we go forward

filtered-subcollection sortBy line is here https://github.com/AmpersandJS/ampersand-filtered-subcollection/blob/master/ampersand-filtered-subcollection.js#L259

[amoskyler]

What are your thoughts for a revision?

Modifying the APIs to both use the same sort function seems to make the most sense, but I could be missing something, in which case documentation clarity would be great.

I can go ahead and make the change and put a PR in whichever way seems to make sense.

[wraithgar]

I'd definitely want to hear from other @AmpersandJS/core-team members, but at first glance it seems to me the code in ampersand-collection is a rough version of what's in underscore/amp/lodash sortBy and we should switch to the latter so we are using an abstraction that's being independently maintained and tested.

[amoskyler]

Seems to make sense.