Update to Typescript 2.0 in order to use the new module resolution

[wassertim]

Since the beta version is there the sbt-typescript could as well be updated. We also need to adjust the properties so the new module resolution works. We can set in the properties in what directory to look for modules (so webjars can be used finally).

This will fix the issue: #31

[wassertim]

@BrandonArp Can you give me the right of a contributor so I can assign this issue to me? Or can you assign it to me otherwise, because I'm already on it?