[eslint] Move from e to event

[oliviertassinari]

This one is for me 💫. The event name has far more meaning than a single letter e.
For instance, have a look at the React documentation https://facebook.github.io/react/docs/forms.html.

I will take care of react/jsx-handler-names once this PR is merged.

[alitaheri]

This must be the happiest day of your life 😆 😆 Looks really good 👍 Thanks a lot 😁

[mbrookes]

All clean and green, notwithstanding npm WARN [email protected] requires a peer of eslint@^1.6.0 but none was installed.

[oliviertassinari]

This must be the happiest day of your life

We are close to it 🚀.

Hum, that's weird. Let's merge this before I get any conflict 😁

[mbrookes]

npm WARN [email protected] requires a peer of eslint@^1.6.0 but none was installed

num update && npm install hadn't helped, but deleting node_modules and reinstalling made that go away.