checkBoxList and radioButtonList to take into account closeSingleTags parameter for <br> tag

Changed checkBoxList and radioButtonList methods to generate <br/> or
<br> separator tags depending on closeSingleTags setting.
Added changelog for pull request #3277
Merge pull request #3277 from hwmaier/master

checkBoxList and radioButtonList to take into account closeSingleTags pa...
updated [SK] translation
Merge pull request #3285 from lubosdz/master

updated [SK] translation
3288 - Check if PHPUnit_Runner_Version exists before requiring.
Updated changelog.
Adhere to code style.
Merge pull request #3289 from hjellek/3288-Check-PHPUnit_Runner_Version-before-requiring

3288 - Check if PHPUnit_Runner_Version exists before requiring
Update yii.php
Merge pull request #3292 from winiarekk/patch-1

Update yii.php
Added check for the existence of a link href attribute pager
Added check for the existence of a link href attribute pager
Add changes #3298 to CHANGELOG
Merge pull request #3298 from dutchakdev/hotfix-3295

Added check for the existence of a href attribute in link pager
Update yii.php

Without word "Atrybut" (english "attribute") this phrase is grammatically incorrect when noun representing field name isn't masculine (e.g. "Hasło musi być powtórzony" should be "Hasło musi być powtórzone". "Hasło" means english "Password"). 
Also, I added missing word "exactly" (polish "dokładnie") and removed word "ponownie" (this is pleonasm http://en.wikipedia.org/wiki/Pleonasm)
Merge pull request #3299 from winiarekk/patch-2

Update yii.php