Ipykernel

- kernelspec: ensure path is writable before writing `kernel.json`. [593](https://github.com/ipython/ipykernel/pull/593)
- Add `configure_inline_support` and call it in the shell. [590](https://github.com/ipython/ipykernel/pull/590)
- Fix `stop_on_error_timeout` to now properly abort `execute_request`'s that fall within the timeout after an error. [572](https://github.com/ipython/ipykernel/pull/572)

- Rework `wait_for_ready` logic. [578](https://github.com/ipython/ipykernel/pull/578)

- Revert "Fix stop_on_error_timeout blocking other messages in
queue". [570](https://github.com/ipython/ipykernel/pull/570)

- Invalid syntax in `ipykernel/log.py`. [567](https://github.com/ipython/ipykernel/pull/567)