fix operator name mathspeak

[mikehaverstock]

There are a couple issues here:

1. we were collecting the full operatorName in a temp variable but didn't push it to the speechArray if it was the last child of the group. It assumed another child would come afterwards and in that iteration it'd finalize the temp operatorname.
2. The autoOps dictionary is only accessible from the RootBlock. So all other blocks fail to convert cos to cosine during mathspeak generation.

I have not fixed (2) and don't plan on fixing it. Fixing (1) is enough for my purposes.