Provide a way to export modules

[j2jensen]

Now that EcmaScript has modules, the more accepted way to organize types is via the export/import keywords. Typescript's "internal modules" have been renamed to "namespaces"

In order to support EcmaScript-style imports, there needs to be a way to cause the generated TypeScript to add an export keyword before each of its declared modules. Perhaps this could be done with a specific command-line flag or something.

You might also consider changing the module keyword to the now-preferred namespace keyword as well.

[drogars]

Interesting ideas. We never really considered what features were available in ES6, because we only really cared about getting it into TypeScript.