Update rules for ESLint 2.0.0

[lkrnac]

After upgrade to ESLint 2.0.0, there were these failures:

  1:1  error  Rule 'no-empty-label' was removed and replaced by: no-labels                 no-empty-label
  1:1  error  Rule 'space-after-keywords' was removed and replaced by: keyword-spacing     space-after-keywords
  1:1  error  Rule 'space-before-keywords' was removed and replaced by: keyword-spacing    space-before-keywords
  1:1  error  Rule 'space-return-throw-case' was removed and replaced by: keyword-spacing  space-return-throw-case

These rules were removed.
This pull request aims to migrate configuration for removed rules.

[Panda-ref]

Merge please.

[baer]

Hi @lkrnac! Thanks so much for the PR - I dono what's going on but I didn't get an email for this. Sorry for the delay. I have a few comments though before I can merge it:

1. The package.json only gets bumped when a release is cut, not on every PR so that part will have to go.
2. Please rebase your commits if you could - I like to try to keep history as clean as I can.

Unfortunately, this PR is not sufficient to upgrade to ESLint 2.0 by itself but it's a great step and is a huge help to me so thanks a bunch for your work. I'll create a new issue to track the rest of it. Once you've made those two changes I'll merge this.

Thanks again.

[baer]

Here's the comment that outlines the remaining work to get on ESLint 2.0. PRs are of course welcome but I'll be getting to it as I have time

#69 (comment)

[lkrnac]

@bear, OK, np. I closed this one and opened separate PR (#71), without problematic commit.

Thanks