Fix the Unit Testing article re: Async
Change tools/editor/troubleshoot's anchors to use article/api-style anchors
Adjusting text around markdown
Merge branch 'master' into issue-19457-editor-anchors

* master:
  Update spec reference; Fixes #910
  Add Adwords for video to Who Uses Dart
  Fix typos; Fixes #841
  Incorporating feedback. Also "hooking" the codelabs up to the menus make them more findable.
  Fix internal microtask links; Fixes #866
  Addresses main concern of #891, but not everything
  Fixes #895
  Fix rest of broken sample links; Fixes #903
  Fix broken link
  s/Januart/January Fixes #913
  Fixing an error that John found.
  Add quite to Who Uses Dart
  Adding a page, with some examples, about deferred loading.
  update Who Uses Dart
  fixes for bug number 20219
  Adding a[name]:target to also have padding top, for Dart Tour
  Fixing Issue 20687
  Adding a note that pub run is slow in 1.6.
s/a name/a id/
Merge branch 'master' into issue-910-markdown-notes

* master:
  Update as per review comments
  Remove 'Function'
  Added marketing tool to Who Uses Dart
  Clarify Adwords for video
  Fixing mixin article example
  Tidy up the README
  Forgot the hero button
  Use download-btn on all download buttons
  Print the TOC; a bit condensed
  Adding hidden-print to a few places
Tweak text
Switched Mac Downloads to the 32-bit; added 64-bit link; cleaning
Add back download-link
point to github for doc issues
Update link to HackerNews Search for Dart
Merge pull request #972 from tosh/patch-2

Update link to HackerNews Search for Dart
Using query .text() to setup the text instead of raw DOM manipulation since it seems the latter was not working on Firefox.
Merge pull request #973 from nicolasgarnier/fix-version-calculation-on-ff

Fixing version calculation on Firefox
Updating Asset bundler to a version that supports Jekyll 2+
Asking Bundle to use Jekyll 2+ in Gemfile (and dependency)
Make sure jekyll serve is launched through bundle exec
Update of the Gemfile.lock
Merge pull request #978 from nicolasgarnier/use-bundle-for-make-server

Make sure jekyll serve is launched through bundle exec
Merge pull request #970 from dart-lang/bugs

point to github for doc issues