missing Coffeescript goodness

The parens around the function args to map, each, and select are ruining a lot of the goodness of code clarity that CS gives you.

Inspect the CoffeeScript implementations of map, each, and select in the repository and compare their current argument syntax with the issue's request. Confirm that removing the parentheses preserves behavior and verify the affected functions using the repository's available checks; done means the three functions no longer use the unwanted parentheses without changing their behavior.

Written by the indexing model from the issue text.