Add a `--no-codesign` option to `ios build` to disable code signing.

* Enable the lint require documentation.

* Track how many public Flutter members lack docs

* Rename the .analysis_options file

This makes Atom happier in the flutter_tools package.

Support "flutter refresh" in the Gradle-based sample project

The way we pick observatory port # has changed and we have broken
logic that handles port 8181. To fix the buildbot, switch to port
8182. We can later figure out what we want to do when we clean up
port handling.

The old VM extention for extracting the timeline data is gone.
Switch to the new '_getVMTimeline' API.

We can work around these in code rather than by post-processing the analyzer
output.

Driver returns exit code 0 even when tests fail. This commit fixes it by
propagating the exit code set by `package:test`.

The .packages file is replacing the packages directory of symlinks.

Now we run `flutter --version` to update our local cache of packages before
running `pub upgrade`, which reads from that cache.

Fixes #2953

This allows the user to build an iOS application bundle from the command line even if no device is attached to the workstation.

Fixes #2723

Any font asset referenced in the fonts section of flutter.yaml will now be
included in the FLX assets.  It's no longer necessary to separately list the
font in the assets section.

filesystem or not.

Fixes #2113

All artifacts for iOS are universal.

In the spirit of https://github.com/flutter/flutter/issues/1220, remove the tear-off regexp in favor of in-line suppressions (if needed).