Fix sliver padding assertion failure that sometimes happens during startup because the app is temporarily built with zero size

Fixes #10106

VERSION: 0.0.6
flutter: 0.0.26
flutter_driver: 0.0.4
flutter_test: 0.0.4

Update Android package name.

Since lib/main.dart does not exist, update test to explicitly build lib/keyboard_resize.dart.

Adds an initial integration test that:
1. captures laid-out widget size
2. focuses a text field to show the keyboard and resize the view
3. unfocuses the text field to dismiss the keyboard and resize the view
4. verify that the final widget size matches the initial size

They are causing nothing but trouble. We should fix these before turning them back on.

See https://github.com/flutter/flutter/issues/9986 https://github.com/flutter/flutter/issues/9987

* Rev versions for alpha branch

* Rev versions after alpha

* is default

* hit target

* correct test name

* review note

Also, fix some logic in SliverPadding.

Fixes https://github.com/flutter/flutter/issues/9954

* enable always_require_non_null_named_parameters lint

* Update home.dart

Also includes minor doc fixes.

Also fixes a small typo.

And add a script to rev the versions.

Turns out that `[]:` means something in markdown, so you have to
escape the `:` with a backslash.