Merge branch 'master' into elasticsearch

* master: (59 commits)
  updated ext composer.json for issue labels
  moved redis to extensions
  fixed whitespaces
  update composer to include sphinx
  Added initial steps about configuring DB-based RBAC
  Fixes #1297: CSRF not generated on error pages
  fixes #1158 mentioned @web alias in docs
  Merged RBAC draft into authorization
  "yii\sphinx\ActiveQuery" updated to throw exception on conflict between "asArray" and "snippetByModel" options.
  Code style and docs at "yii\sphinx\*" fixed.
  Docs for Sphinx extension updated.
  Redundant typecast removed from yii\sphinx\ActiveRecord::create()
  yii\sphinx\Command reworked to extend yii\db\Command. yii\sphinx\DataReader removed.
  Sphinx Active Record updated to be compatible with ActiveDataProvider.
  Sphinx documentation updated.
  Sphinx documentation updated.
  Sphinx has many relation test prepared.
  Sphinx Query refactored.
  Create relation methods added to Sphinx Active Record.
  Sphinx Query Builder updated to respect column types for where statements
  ...
moved elasticsearch to extensions
Merge branch 'master' into elasticsearch

* master:
  fixed broken sphinx AR::attributes() declaration
  updated properties of extensions
  fixed cubrid limit
  added redis Session
  allow redis connection to be configure directly in cache
  removed unneeded setting.
  refactored redis cache.

Conflicts:
	extensions/redis/README.md
fixed redis session init() call

fixes #1319
Merge pull request #1295 from yiisoft/elasticsearch

[WIP] Elasticsearch