Add a raw hello_world that shows "Hello, world"

Fix color of icons in drawers in dark theme.

Disable flakey test.

See https://github.com/flutter/flutter/issues/1854

This makes it match the material spec more.
https://www.google.com/design/spec/style/icons.html

Fixes https://github.com/flutter/flutter/issues/1357

Previously, hello_world.dart was an interactive circle. I've moved that
to touch_input.dart. We should eventually harmonize the touch input
examples at all the layers.

Adds documentation to the layering examples

allow any android sdk version

This library is being folded into dart:ui.

Fixes #83

Clean up the standalone examples

Our examples have been growing organically over time. This patch cleans
them up to illustrate specific aspects of Flutter.

@abarth

SawTooth

SizeObserver crusade: drawer

Horizontal and Vertical Draggables

Don’t require global keys for Input, fixes #1828

Drawer doesn't need a SizeObserver, since it only looks at the size
in event handlers. It can just go and probe the tree to read the size.

Also, change from using _kEdgeDragWidth to using _kWidth when figuring
out how much of the drawer to show when dragging it from the edge, since
that is more likely to match the drawer's width.

Expose more debugging tools in Stocks

Use mojo's scripts for downloading android tools on the bots

R=abarth@chromium.org

Remove address_book and mine_digger

These examples aren't particularly good models for new Flutter apps.

Bump the flutter_gallery_assets version, rename example apk dirs to android, remove BUILD.gn files

Remove gcm package from the repository.

rename example apk dirs to android
removed all BUILD.gn files

I moved it to https://github.com/mpcomplete/flutter_gcm for now.

Draggables were disappearing

I forgot to wrap the state changing in a setState. Oops.

Gallery Typography demo

Fix padding for ScrollableList

Previously we had totally wrong behavior. Now we have more correct behavior and
testing.

Fixes #1808