Proposed fix for "pages" problem.

Pages are made in their own folder and won't display any non-page
templates by accident. This doesn't yet solve nothingman's issue because
posts are still checked before pages (i.e. plugins run before
displayTemplate). The Bookmarking plugin would have to run its own check
for clashes (easy if the pages are in their own folder).
New "pages" folder with an example file in it.