WIP - Add linting support

[Marsup]

Hello,

As discussed in outmoded/discuss#22, I'm trying to implement linting in lab.
This is a WIP and shouldn't be merged right now as tests are not even done.
So far I only have support for eslint, I included @geek's rules but lab itself is full of errors so it'll need tweaking.
It will automatically detect eslint settings at the root of the project and if none use what should be our default rules.
The possibility to have multiple linters is deliberate and probably wanted.
Console output was faster to implement but others will follow.
I'd like feedback about my approach.

Thanks.

[geek]

else on newline

[geek]

I like this approach, be sure to add more tests and document the option in the readme.

[Marsup]

Updated the PR with these suggestions. I've actually spent a lot of time trying to find the correct settings to validate lab itself. If you have better rules before starting writing our own, I'll take em :)

[geek]

@Marsup thanks, I'll merge this after 4.5.2. Maybe we should start with only a few rules?

[geek]

@Marsup any chance that you can add some tests for the new option?

[Marsup]

Sure, I'll hopefully complete coverage in a few days, just a bit busy currently.

[Marsup]

@geek Coverage is good now, linting doesn't make a test run fail though, but at least it's usable until we manage to find rules that fit the projects. Travis's output is weird, a red cross but no error, I don't get it.

[geek]

Thanks for this, it will be a huge help

[lock]

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