Suppress tonal kickers on a collection

Stephan Fowler & I:

Adds an option to suppress tonal kickers on a collection. You might want to do this, for example, if you had a collection that was called Analysis and only contained Analysis items.

![screen shot 2014-09-30 at 15 02 33](https://cloud.githubusercontent.com/assets/1001642/4459389/ab212936-48aa-11e4-8685-6878ec0d7cd1.png)

This thing basically produces an enum-like thing for pattern matching later, for that exact reason. At some point we have to have the code that just does lots of checking whether x or y thing is true, though, and that's happening here at the moment. Would be nice to move it somewhere more central eventually.