Blocked on https://github.com/flutter/flutter/pull/2771

Add some docs for people looking at bindings

Improve Stack documentation.

Fixed some typos.

handle android n in the android sdk

Use Canvas#drawParagraph

Material: Fix selected tab indicator animation.

Sniff service protocol port from device

- The indicator no longer goes crazy when you select another tab while
  it's animating.
- The indicator's trailing edge lags behind the trailing edge, giving it
  a neat stretchy feel.

BUG=https://github.com/flutter/flutter/issues/1617
BUG=https://github.com/flutter/flutter/issues/1955

We'll eventually remove Paragraph#paint.

Fixes #2694

Update engine

update listen to work w/ ios devices

show failures with the initial pub get

Refactor the build commands

Fix spelling of dependents

Noticed in #2733

Flesh out rendering library top-level docs

Update engine.version

Use FractionalOffset for gradients

Rename AnimatedWidgetBase -> ImplicitlyAnimatedWidget

These were using Offsets, but they're really FractionalOffsets.

Fixes #2318

The previous name was confusingly similar to AnimatedWidget, which is
for explicit animations.

Tapping drawer during animation causes it to stick

The problem was we were using a tap gesture to stop the motion of the
drawer and a drag gesture to settle it. That can cause a broken
lifecycle. Now we use a single drag recognizer to drive the whole
lifecycle.

Fixes #775
Fixes #1276

Change SizeTransition API to take a double instead of FractionalOffset for alignment

Improve dartdoc for GlobalKey

Fixes #2708

Update CONTRIBUTING.md