hackery on likely_import and klepto.archives.dir_archive(serialized=False);
dir_archive(serialized=False) use dill.source.getsource for lambdas;
removed _namespace from module-level import in pox; basic test of dir_archive


git-svn-id: svn+ssh://svn.mystic.cacr.caltech.edu/pathos/klepto@582 8bfda07e-5b16-0410-ab1d-fd04ec2748df
Merge branch 'master' of https://github.com/uqfoundation/klepto