Put this in your $(HOME)/.gdbinit file with proper path to pretty printers:
python
import sys
sys.path.insert(0, 'YOUR_PATH_HERE/boost-container-pretty-printer')
from printers import register_boost_container_printers
register_boost_container_printers (None)
end
If you're using windows - visual studio 2010 then, you could use autoexp.dat which is located in the Program Files\Microsoft Visual Studio 11.0\Common7\Packages\Debugger directory.