don't inline DA.contains()
Merge pull request #14 from Dr-Emann/Fix_BitVector

Fix bit vector
Merge branch 'dev' of github.com:polygonal/ds into dev
don't inline TreeNode.unlink
more conservative inlining
optimize TreeNode: don't allocate stack arrays when doing iterative pre/post-order traversals.
save 4bytes per TreeNode by merging timestamp and childcount
update README
optimize TreeNode.contains (inline, prevent function allocation)
update README
all: fill() return this
TreeNode
replace Sprintf in asserts with string interpolation
return this node for chaining
improve TreeNode.toString()
implicit que for TreeNode.levelOrder
switch to haxelib3
update README