attempt at fixing issue 15, adding using namespace osg to osgDB.i
attempt at fixing issue 15, adding using namespace osg to osgDB.i

--HG--
extra : convert_revision : svn%3A9ea0355d-b33e-0410-9de5-817935624dc7/trunk%40177

cmbruns/osgswig,cmbruns/osgswig,cmbruns/osgswig,cmbruns/osgswig,cmbruns/osgswig