[zendframework/zf2#1] completed testing PhpRendererStrategy
[zendframework/zf2#1] completed testing PhpRendererStrategy

- Added tests for content placeholder mutators
- Added tests for attach/detach

codeliner/zend-view,zendframework/zend-view,bfolliot/zend-view,zendframework/zend-view,Maks3w/zend-view,MadCat34/zend-view,bfolliot/zend-view,codeliner/zend-view,ezimuel/zend-view,MadCat34/zend-view,ezimuel/zend-view,FabianKoestring/zend-view,FabianKoestring/zend-view,Maks3w/zend-view