ipython/ipython — pull request #7259 by takluyver (2014-12-17 18:41:42+00:00)
Title: Fix HEAD requests for kernelspec resources

Closes gh-7237
Closes gh-7258

StaticFileHandler.get() is a coroutine. When Tornado calls a handler method, it uses the return value to determine whether or not it's a coroutine. So when head() calls get(), it needs to pass the return value on for Tornado to handle it properly.