Update nodelist-array.js

Update doc for NodeList.pop()
Update nodelist-array.js

Update doc for NodeList.shift
Merge branch 'master' of git://github.com/davidfmiller/yui3 into davidfmiller-master
link element should reference cssgrids instead of deprecated grids.css
Fix Tree README
Fix a confusing typo in the Template user guide. Fixes #543
Replace political sample text with something a little less divisive.

I still feel really uncomfortable with how much of this example is lifted
straight from the Boston Globe (especially the hot-linked images), but I
don't have time to fix everything right now.