* .gitignore (tsconfig.tsbuildinfo): Ignore generated file (used for
incremental builds).
* Makefile.am (tsout): New variable an recipe.
(modindex, check): Depend on tsout.
* dummy.ts: New (temporary) file. Will be removed once we have at least one
ts file.
* npm-shrinkwrap.json: Update.
* package.json.in (devDependencies)[typescript]: New dependency.
* tsconfig.json: New configuration file.