Start developing automated boostbook tests.

Just a shoddy python script for now. The main point of using python is
to normalize the ids generated by boostbook, which make comparisons
difficult. I'll probably switch to using whatever build tool we settle
on.

[SVN r64832]

tools/boostbook

@@ -1 +1 @@
-Subproject commit a2d077e2be13f307aecd9a8ce2046824977cc026
+Subproject commit b828baab1d93aefce86af7776783465d49faa55a