Add lock for tarball unpacking.

This allows surefire to run multiple tests in parallel even if the tarball must be
unpacked first.
Merge pull request #10 from hgschmie/master

Add lock for tarball unpacking.
Move build script to build 9.3.2
Fix up unpack locking.

- don't lock waiting threads forever. If the postgres has not shown up in 60 seconds, bail.
- findbugs fixes.