Added `yii\console\Controller::EXIT_CODE_NORMAL` and `yii\console\Controller::EXIT_CODE_ERROR` constants, `yii\console\MigrateController` now returns `yii\console\Controller::EXIT_CODE_ERROR` in case of failed migration

* 'master' of github.com:yiisoft/yii2:
  Fixes #699: fixed wrong usage of self and static
  Fixed wrong links

breaking changes.

Fixed wrong links

* 'master' of github.com:yiisoft/yii2: (43 commits)
  `BaseActiveRecord::findAll()` comment fix
  Fixes #2913: RBAC `DbManager` is now initialized via migration
  [NL] Removed app.php
  [NL] brought translations up to date
  Fix for comparing numeric attributes in JavaScript
  Better Gii caption english
  Fix for comparing numeric attributes in JavaScript
  HHVM compatibility Fixes for Yii 2 Console Application
  Rough creation of a doc style guide
  typo
  Finished Edits
  Edited up to Active Record
  renamed chapter to section [skip ci]
  Catalan translation
  Edited up through "I18N"
  Cleaned Up
  updated guide toc [skip ci]
  Update concept-behaviors.md
  Fixed wrong links [skip ci]
  Fixed document for multisort in BaseArrayHelper
  ...

[ci skip] Better English for Gii Caption

`BaseActiveRecord::findAll()` comment fix

[NL] brought translations up to date

Fix for comparing numeric attributes in JavaScript

Conflicts:
	framework/assets/yii.validation.js

HHVM compatibility Fixes for Yii 2 Console Application 

Should have started this before; important to maintain consistency.

[ci skip]

Catalan translation