WAI 2.0 and custom output path control

Update to WAI 2.0..  Also, I wanted a little more control on the filepaths on disk
so I added a new renderStaticPagesTo function.  Looks like the latest on github
doesn't match the latest on hackage (latest on github is 0.2.1 and hackage has
0.2.1.1).  Either you can do the merge or if you push the 0.2.1.1 to github I can
merge.