Added $trim property to CRequiredValidator
Added CRequiredValidator test
Added CRequiredValidator test case for $trim => true
Added changelog line
Modified changelog line
Added @since for $trim property
changed changelog line
Merge pull request #2354 branch '2343-required-validator-trim' of https://github.com/AnatolyRugalev/yii into AnatolyRugalev-2343-required-validator-trim

* '2343-required-validator-trim' of https://github.com/AnatolyRugalev/yii:
  changed changelog line
  Added @since for $trim property
  Modified changelog line
  Added changelog line
  Added CRequiredValidator test case for $trim => true
  Added CRequiredValidator test
  Added $trim property to CRequiredValidator

Conflicts:
	tests/framework/validators/ValidatorTestModel.php
better doc for CRequiredValidator::$trim

pr #2354
Merge branch 'master' of https://github.com/yiisoft/yii

* 'master' of https://github.com/yiisoft/yii:
  hu lang. fix