Position for the tokens

[tunnckoCore]

Hey, that's great lib, thanks! Seems i can use it but need positions of the tokens. And in addition, can we allow foo-bar keys without quotes? or through some option.

Like that

{ type: 'key',
  value: 'foobar ',
  position:  {
     start: { line: 26, column: 78, offset: 811 },
     end: { line: 27, column: 5, offset: 816 } } }

Offset and line are there, just need to be added to hash, but for the columns need more maybe... Reviewing now.

[tunnckoCore]

Huh, got it working, haha :) Will PR after cleanup.