Comments should be stripped from bundles

[mikecao]

When bundling with glslify, comments are not removed from the final source string. I'm trying to the output to be as packed as possible. I am currently using a custom function in my own fork of glslify-bundle that does the trick:

function strip_comments(tokens) {
  for (var i = 1; i < tokens.length; i++) {
    var token = tokens[i]
    if (token.type == 'block-comment' || token.type == 'line-comment') {
      tokens.splice(i--, 1);
    }
  }

  return tokens
}

then in the Bundle function I just do:

this.src = string(clean(strip_comments(trim(tokenize(this.src), true))))

Would you accept a PR for this change?