Punctuation improvments

[simurai]

Originally reported in simurai/duotone-dark-syntax#8. Punctuations aren't supported that well.

For example if you try to highlight any general .punctuation with

atom-text-editor::shadow .punctuation {
  color: red !important;
}

in this example:

int main()
{
  str = malloc(count * sizeof(int));
  die("Memory error.");
}

most parentheses and semicolons aren't styled (red) and just "plain text".

[winstliu]

This seems more like a bug than an enhancement since only half the things are being tokenized.

[winstliu]

Not entirely fixed yet.