Enable CM_RenderAdapter_Abstract::_getTplPath() to search across all namespaces
search templates accross all namespaces when fetching meta-keywords and meta-description
Merge branch 'master' of github.com:cargomedia/CM into issue-1138

Conflicts:
	library/CM/RenderAdapter/Page.php
fix broken fetchKeywords()
use boolean consistently
simplify default param value assignment
add unit test for CM_RenderAdapter_Abstract::_getTplPath()
use hard-coded mock classname
separate test into clear block for subtests
add test for class hierarchy traversal
add assertions on return-value
add test for nonexistent template file
return correct path in mock methods
Merge pull request #1181 from alexispeter/issue-1138

Issue 1138