ENH/API: added from_taxonomy
PY3/TST: better test and py3 compat
ENH/API: added TreeNode.to_taxonomy
ENH: can pass filter to to_taxonomy
API: TreeNode.from_taxonomy now can accept an iterable
Move subsample files out of _subsample directory
Move extensions to be named __subsample
Update subsample unit test imports; regenerate C code from Cython
Fix broken subsample doctest
Fix formatting of module import in subsample unit tests
Move ssw wrapper code up one level, rename _ssw to _lib
Regenerate C code; update imports to ssw wrapper
Add __init__.py to _lib dir
Merge pull request #663 from jairideout/issue-658

Move python/cython code out of underscored directories
DOC: changelog mention
Merge branch 'master' of github.com:biocore/scikit-bio into taxtree

Conflicts:
	CHANGELOG.md
DOC: whitespace powertripping @ElDeveloper :)
Merge pull request #643 from wasade/taxtree

ENH/API: added from_taxonomy
Merge branch 'master' into issue-518

Conflicts:
	CHANGELOG.md