Squashed 'site_scons/' changes from bc3d0e2..2e4403b

2e4403b Update build.sh location for boost 1.56

git-subtree-dir: site_scons
git-subtree-split: 2e4403b63e9d5775321796ddcc6545ce4388ba7e
Merge commit '972c6fedcc58278dc9c8d42027061bac47b7deef'