Add grunt check

[samreid]

From #404 (comment)

Using more specific terms for each item frees us up to rename the grunt pre-commit to something more like grunt check etc. Recall that grunt pre-commit should be the entry point for git precommit hooks, but that grunt check can be smarter about cross/multi repo checks.

[samreid]

grunt check is marked as deprecated and forwarding to grunt type-check. I added one TODO in the code. Once #404 is closed we can decide what to do here. Assigning to @zepumph for consideration, feel free to unassign/reassign/etc.