Add plenty of rules (#2, #3, #5, #6, #7 and #8)

[jfmengels]

I implemented the rules in issues #2, #3, #5, #6, #7 and #8.

I'm not that familiar with Ava (but pretty excited about it, so I felt pretty motivated to do this), so let me know if I've got anything wrong, if there's anything to fix, or if you prefer this being split into multiple PRs.

Also, if someone can tell me why the use of const makes the tests fail in Node 0.10/0.12 but is ok on master where I also see const...

[sindresorhus]

Oh wow. This is amazing!

or if you prefer this being split into multiple PRs

Yes, please. That would make it a lot easier to review and easier for you to update :)

Also, if someone can tell me why the use of const makes the tests fail in Node 0.10/0.12 but is ok on master where I also see const...

AVA transpiles the test files with Babel, but not the code itself. So you can only use const in the test files.

[jfmengels]

AVA transpiles the test files with Babel, but not the code itself. So you can only use const in the test files

Gotcha!

"or if you prefer this being split into multiple PRs"
Yes, please. That would make it a lot easier to review and easier for you to update :)

Ok. Will split it up later today then. I hope there won't be too many conflicts as some of them touch the same portions (util, index and README), but I'll handle that if it comes up.

Oh wow. This is amazing!

Glad you like it ;)

[vadimdemedes]

Thanks for an amazing contribution, @jfmengels!

[sindresorhus]

Lol. So much Leonardo :p

[jfmengels]

(couldn't resist)

I'll close this one, I've opened a few others (#13, #14, #15), feel free to merge however you feel, I'll come around to handle conflicts). I'll create the rest of them when those get merged, as some use code that has been added in those PRs (util.js) and merging them before will smooth things IMO.

And by the way, thanks for making this great on-hands introduction to eslint rule writing :D

[sindresorhus]

Yes, good idea, was going to mention that. Better to handle some of them first.