* master: (806 commits)
  avoid confusing docs about autoload return value
  doc fix.
  Fixed doc.
  Fixed autoloader behavior according to leading \
  Fix in RequestPanel
  changed to trace from info.
  Removed yii\debug\Module::enabled.
  minor enhancement of debugger.
  Refactored the basic app.
  Added ErrorAction.
  Use `hasAttribute()` instead to avoid code duplication
  refactored NavBar and basic app navbar.
  test break fix.
  test break fix.
  Fixed test breaks.
  #735: removed hiddenInput to avoid confusion.
  ResizableAsset typo fix!
  Update radio and checkbox due to e3801fbf
  css fix.
  Fixed the basic app template.
  ...

Conflicts:
	.travis.yml
	tests/unit/data/config.php