remove forEach, now works in ie<9

I'm trying to get tape's tests to run in all the browsers, so I'm swapping out some code from tap to use tap-parser to verify the output of tape's TAP stream. I'm using split in tap-parser and ie8 trips over the forEach in split. I replaced forEach with a for loop and now the tap-parser tests are running in ie8 again: http://ci.testling.com/substack/tap-parser