Formatting fixes for ESLint

[ilanbiala]

This has all the formatting changes and ESLint support (temporarily so we can confirm it passes in Travis).

[ilanbiala]

@lirantal @mleanos @codydaig once you guys give me the word and are happy with this formatting PR, I'll remove ESLint support from this and merge it and then we can go back to #990 for actual ESLint support.

[codydaig]

LGTM.

Also, I'm cool with combining the PRs and just squashing down to two commits (one for the eslint addition, and one for the formatting changes).

[mleanos]

I'm also fine with two commits in one PR.

I'd like to take this for a quick test run, and review. I should be able to complete that in an hour or so.

[mleanos]

LGTM. Thanks @ilanbiala

[mleanos]

@ilanbiala Upon looking at this again, I realized the Gulp task is failing.. It throws an error at this line
https://github.com/meanjs/mean/pull/991/files#diff-b9e12334e9eafd8341a6107dd98510c9R112

4:58] Starting 'eslint'...
4:58] 'eslint' errored after 478 ms
4:58] TypeError: undefined is not a function

[ilanbiala]

@mleanos I'm thinking it stems from this line because we don't pass in a formatter and when it tries to write it can't execute the function because it's undefined https://github.com/adametry/gulp-eslint/blob/master/util.js#L180. Can you paste in the stack trace if there is one?

[ilanbiala]

I'm going to do them as 2 separate PRs because I already have it set up like that locally. @mleanos try adding .eslint in between plugins.format() because the plugin is eslint and the method is format. Once you confirm, I'll merge this and then the actual ESLint setup in the other PR.

[mleanos]

@ilanbiala adding ".eslint" to that line fixed the Gulp issues..

This LGTM now! Thank you :)

[lirantal]

I missed the party but good thing to see this already fixed and joined in with the eslint file!
Great job @ilanbiala