Use core stream.Transform if 0.9+
Merge pull request #2 from brycebaril/wip

Use core stream.Transform if 0.9+
@0.0.5
added through2.ctor() export
Allow options override in Transforms created by ctor.

Add tests/docs for ctor
Tweak reuse test to show that new instance is independent
Make `this.options` available to instances.

Merge override options with ctor-set options.
0.0.6
@0.1.0
no transformFunction = PassThrough stream @0.2.0
non-buffering passthrough @0.2.1
@0.2.2, update xtend dep
Add david-dm.org badges to README
Update dependencies
0.2.3