Make GitLab js-precompiled really update Cargo.toml in main repo (#2869)

* Src outputs into build.sh

* reset detatched head

* add .dist

* testing for this branch

* update comments, be explicit is what we are doing

* [ci skip] js-precompiled 20161025-173946

* Revert "[ci skip] js-precompiled 20161025-173946"

This reverts commit 0d23f7683c6e18e4642566313963c130684afa90.

* remove testing branch

* typo