Moving ember-cli-typescript to dependencies

[scalvert]

As indicated by the package, this should be a dependency, not a devDep.

[rwjblue]

Hmm, this doesn't seem quite right. We intentionally do not publish .ts files (so we shouldn't need to include this as a dep)...

[scalvert]

Ya I think the message in the console is not nuanced/is misleading:

WARNING: `ember-cli-typescript` should be included in your `dependencies`, not `devDependencies`

I was trusting that direction, but thinking more it does make sense what you're saying, and this message should be updated to apply in the following way:

• for packages that publish .js files to consumers, devDependencies is fine
• for packages that publish .ts files to consumers, dependencies is required.

[scalvert]

Happy to revert in light of this. It's not published yet.

[chriskrycho]

Just came across this and: yeah, we'll need to update that in light of v2 addons.

[scalvert]

This was reverted in #360

[chriskrycho]

Yep! That’s how I got here actually. 😅