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
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