Upgrade: Dependencies (fixes #40)

[btmills]

This will pull in the changes to eslint-config-eslint from eslint/eslint#4910, which requires eslint@2. Updated object-assign as well to clean up npm outdated output.

[btmills]

Looks like npm@2 doesn't like the peer dependency on [email protected]. Barring some creative solution, I'm going to hold off until ESLint 2 is released.

[btmills]

Turns out the solution was as simple as dropping the peer dependency. eslint-plugin-react doesn't specify a peer dependency and specifies the 2.0 beta in devDependencies, which is exactly what this does.