factor out and document anyvcs.probe()
add test for anyvcs.probe()
factor out _get_repo_class
write anyvcs.clone()
write GitRepo.clone()
write clone unit test
write HgRepo.clone()
write SvnRepo.clone()
add anyvcs.clone() to documentation
Merge branch 'feature/clone' of https://github.com/OEP/python-anyvcs into OEP-feature/clone
close pipes to subprocesses
Merge branch 'OEP-feature/clone' into develop