Attempt to sort licenses in list

Not quite sure why it is different in prod than dev (though I remember coming across issues w/ `sort` inconsistency before), but this should do the trick.  Fixes https://github.com/github/choosealicense.com/pull/162#issuecomment-30769453.  See also: https://github.com/jekyll/jekyll/issues/1802#issuecomment-30823393

/cc @XhmikosR