tools: set eslint comma-spacing to 'warn'
eslint takes comment as whitespace, resulting in code like
[0x2E/*'.'*/, 0x2B/*'+'*/, 0x2D/*'-'*/]
failing the linter. This change reduces the comma-spacing
rule to a warning, making make lint
pass. I also fixed some misc whitespace issues in .eslintrc
.
encountered in: https://github.com/iojs/io.js/pull/1650 eslint issue: https://github.com/eslint/eslint/issues/2408
cc: @yosuke-furukawa