Fix how modules are included

import dist instead of src, for node's sake

Node doesn't understand import statments yet, so all imports in es6
files need to point to already transpiled files, or node will get
confused.

Node module and helpers

This release includes:

• Node.js interface (i.e. var tornado = require('tornado.js');), which exposes the compiler.
• Almost all helpers currently available from dustjs-helpers
• Various bug fixes

Fix CLI tool issues

Command line tool should now work when installed with npm.

Compile Tornado from the command line

This release includes:

• a CLI command for compiling tornado from the command line
• a rewritten compiler to allow for extensibility
• various other improvements

Initial release

The primary purpose of this release is to reserve the tornado.js name in npm. The project is not yet at a state where npm install tornado.js will be terribly useful, but that point is not far off, so the time has come to reserve the name.