Simplify os::hostname() in libstout.
Run Hadoop tutorial binaries from within build dir.
Include pre/post-package hook scripts in Hadoop tutorial.
Allow ending Hadoop tutorial early.

Allow someone to end tutorial after building/packaging complete.  You
can also skip the test part by exporting SKIP_TESTS (i.e., 'make hadoop
SKIP_TESTS=1').
Use XZ (LZMA) for package on Linuxes.
Build fix for HadoopPipes.cc with GCC 4.7.
Check for Python.h in configure script.
Use more portable paths for tutorial test.