update gitignore and analysis_options

use the REVISION file when building ios apps

Reenable canvas test.

SizeObserver crusade: snap alignment

Try to locate the toolchain in the output layout used by the Flutter …

Remove the SizeObserver you need to use snap alignment in lists by
having the lists provide the size themselves in the callback.

Also, remove snapAlignmentOffset since we couldn't figure out how to
explain it and it's not really needed.

This patch again stops Traivs from uploading docs now that the new infra seems
to be better at it.

This reverts commit 196c881c.

Gallery Colors demo

This reverts commit 8a458098.

Stop Travis from uploading docs

Clean-up around progress indicators.

We now upload these from Chromium infra.

Assert that custom painters balance save/restores.

Ignore generated/ instead of ios/

Move StepTween to tween.dart.

Move _buildIndicator() methods to be next to the build() methods they're
used from, so that reading the code is easier.

Fix typos, add some comments, style nits.

ImageCache should be a public type

Fix style nits in progress_indicator.dart

I'm guessing the recent changes to the bindings fixed this crash.

Closes https://github.com/flutter/flutter/issues/248.

toString for Tween and ThemeData

We expose `imageCache`, which is an ImageCache, but previously the class
was private which means there was no documentation for the methods on
that object.

Fixes #1750

This patch tightens up the imports in this file and hides some more of
the implementation details by making RepeatingCurveTween and StepTween
private.

Also, removed a CurvedAnimation with a linear curve.  That's not needed
because the animation controller itself is an Animation<double>.

This animation expands/collapses an arc that's 3/4ths of a circle.
The next iteration begins where the previous appeared to finish.
This happens while the whole thing rotates, such that the starting point of each
expansion moves in a star-wise pattern around the circle.

See:
https://www.google.com/design/spec/components/progress-activity.html
(note: the video here demonstrating this animation is actually slightly incorrect...
we'll hopefully update it soon)

Allow users to upgrade their iOS engines without removing their edits to the Xcode project

Add versionCode and versionName to default Android manifest

These are required to upload to the store.

Fixes #1006

rename the apk/ directory to android/