As the constructed objects have an any type, the
resulting containers are assignable to any type:
var x: Map<string, number> = new Map();
That is useful to avoid having to specify types
twice when declaration and assignment are in
different places.
Adds a gulp task which builds the .ts files (in the cjs build only).
The new files have extension .ts since they are now valid typescript.
Unfortunately until Typescript can emit System.require, we have to keep the old .es6 version
so traceur works inside the Karma preprocessor. This should be fixed soon.