I manually updated the typescript dependency which breaks the build, even when manually upgrading the compiler-cli to ^5.1.0, so basically 5.1 doesn't work with typescript 2.5.3 as indicated in the announcement.
I also don't get the point of upgrading to the latest angular-cli v1.6 and using it to create the same 5.0.0 app that v1.5 did.
Is the way to create a v5.1 ng app is for everyone to manually update all dependencies to ^5.1.0?
If you grab the latest angular-cli and do `ng new foo`, you will get the latest 5.1.0 update. Or if you have an existing app, run `npm install` but make sure you update your package-lock.json file.