Feature request: Performance tuning option, starting with brushtail

[m1sta]

Iced crosses a boundary by adding await and defer to coffeescript. Now that this boundary has been crossed we should make the most of it.

There are a number of things that javascript writers can do to substansially improve the performance of their code. It would be great if iced could automatically apply some of these for the developer transparently.

The first example I can think of is tail call optimisation. Being able to enable this via a new command line option and the integration of https://github.com/puffnfresh/brushtail would be great.

Next on the list might be function inlining.