Generate docs for more of our packages

Forgot to add the file

This is a png version of the flutter logo generated on my desktop
from the SVG in the flutter.io repository.

TBR @hansmuller

I also stopped pushing docs to domokit.org I presume we
were doing that to not break old links.  @abarth

@sethladd

Fix travis builds and linter warnings

Add a 'flutter ios --init' command that fetches the Xcode project from the cloud and configures it for a given flutter project

Add a 'flutter ios --init' command that fetches the Xcode project from the cloud and configures it for a given flutter project

Add an icon to the Flutter Material Gallery

@abarth @hixie

Add an icon for the Stocks app.

Not great.  Better than nothing.

@hixie

Fix `flutter apk` to work with resources

I screwed up my last change, turns out the package command
is sensitive about having all of its flags before args.

Also made it possible to control the resources directory
from the command line per the review comments in the previous change.

@jason-simmons

Correct the TabBarView swipe selection change animation

The TabBarSelection change animation needs to start where the fling's drag gesture ended rather than from zero. The intial vlaue of progress for the TabBarSelection's performance is now converted from the range used during an interactive drag, to the range used when animating from the previously selected tab to the new one.

TabBarSelection now requires a maxIndex parameter.

Add support for bundling apk resources

I also made it so that `flutter apk -v` showed what
commands it was running by moving off of a custom _run
function onto the base/process.dart runChecked shared
by other commands.

@jason-simmons

The TabBarSelection change animation needs to start where the fling's drag gesture ended rather than from zero.  The intial vlaue of progress for the TabBarSelection's performance is now converted from the range used during an interactive drag, to the range used when animating from the previously selected tab to the new one.

TabBarSelection now requires a maxIndex parameter.

analytics and a homepage for docs.flutter.io

Make Navigator.canPop handle the no-navigator case

Close some sentences. (rendering dartdocs)

Scaffold calls this to see if it should show a back arrow when there's
no drawer. With this change, everything continues to work.

Fixes styled_text and probably others.

Pause and resume of all tracks in SoundTrackPlayer

Apply looping and volume in the SoundTrackPlayer

Support application lifecycle state change events in the framework

Move flutter tests from packages/unit to packages/flutter/test

Catch exceptions in pointer handling

Be clearer about whether renderView can be null.

Aggressively try to catch misuse of DropDownButton

Canceling a dropdown menu selects null value

Previously we didn't distinguish between canceling the menu (which
popped the route with no return value, i.e. null) and explicitly
selecting an item whose value is null (pop with value null). Both fired
onChange(null).

Now we box the return value so we can distinguish the two cases.

I would have preferred to just disallow "null" as a value but it turns
out people like being able to use "null" as a value for much the same
reason we do, and it seems best for us to pay the complexity cost of
boxing than having everyone else do it. :-)

Added BottomSheet demos to the Material Gallery

Fixes https://github.com/flutter/flutter/issues/948.
I hope.