update archiver packaged used for building

The old version of archiver didn't seem to include CRCs. This would cause errors from 7zip and made me nervous about the builds being correct.

src/common/test/utils-test.js

@@ -564,6 +564,7 @@ describe('Utils', function() {
 
     // I have found that Range.intersectsNode is broken on Chrome. I'm adding
     // test to see if/when it gets fixed.
+    // TODO: This test seems flawed. Why would test-elem-2 intersect the range that just contains test-elem-1? Hand-testing suggests that this is working as expected in Chrome and Firefox. Code that works around this probably-nonexistent bug should be reconsidered (especially since Postbox support is dropped).
     it('Range.intersectsNode is broken on Chrome', function() {
       var range = document.createRange();
       range.selectNode($('#test-elem-1')[0]);