Get rollup-optimization to work

[svi3c]

At the moment rollup optimization does not do any tree shaking in this template.
As mentioned in frankwallis/plugin-typescript#159, rollup optimization with plugin-typescript should work now.

[DorianGrey]

It seems we will have to update plugin-typescript to the most recent version (5.2.7 atm.). However, this causes a curious error as described here: frankwallis/plugin-typescript#171 .

[DorianGrey]

The linked issue got resolved (version bump is in master), however, using the

{
  // ...
  module: "es2015",
  target: "es5"
  // ...
}

trick results in a somewhat curious error:

err  Error: A module cannot import itself (npm:@types/[email protected]/index.d.ts!github:frankwallis/[email protected]/plugin.js)
    at /home/linne/Projects/ng2-jspm-template/node_modules/rollup/dist/rollup.js:8915:13

[DorianGrey]

The descriptions in frankwallis/plugin-typescript#97 might help as well.