API: TreeNode.tip_tip_distances returns DistanceMatrix
ENH: added TreeNode.shear
ENH: added compare_rfd
ENH: added TreeNode.count
API: added from_file
TST: symmetric test on RFD
DOC: raises section added to shear
TST: added additional test on accumulate_to_ancestor
TST: make sure from_newick can handle list
ENH/TST: LCA raises when no tips are found
TST: test for TreeNode.levelorder
TST: pre_and_postorder traversal test
TST: test for tips()
TST: test for remove_deleted
TST: test for __iter__
Merge branch 'master' of github.com:biocore/scikit-bio into such_tree
PY3: compat
DOC/MAINT: merge conflicts and RF ref
Merge pull request #315 from wasade/such_tree

Such tree
Merge branch 'master' into tree_method_addition

Conflicts:
	skbio/core/tests/test_tree.py
	skbio/core/tree.py