Added asElapsedTime function
Typo in asElapsedTime description
Call Yii::t everytime instead of passing a template variable
Typo
asElapsedTime can now take DateInterval as parameter
asElapsedTime style improvements
asElapsedTime can now take a DateInterval string as a parameter
Added support for inverted intervals (future time) and unit tests
Removed debug code, changed doc
PSR-2 compliance
Merge branch 'master' of https://github.com/yiisoft/yii2

Conflicts:
	framework/base/Formatter.php
	tests/unit/framework/base/FormatterTest.php
Merge branch 'master' of https://github.com/yiisoft/yii2
Changelog and doc