Dev Added helper function to directly access the Yii app AND enable correct code completion.
Dev Changed shortcut function to App() from LS()
Dev Added path for twig cache files.
Dev Added Twig templating engine.
Dev Added twig_cache directory and twig_helper.
Dev added basic twig template, first draft.
Dev Partial working version using Twig for (most of) survey rendering.
Dev Use the template twig_default.
Dev Might contain (lots of) errors.
Merge branch '2.1' of github.com:LimeSurvey/LimeSurvey into 2.2

Conflicts:
	application/views/admin/survey/subview/tabResourceManagement_view.php
Changed some line endings +settings.
Dev Fixed new question creation: retrieving question atttribute metadata based on attribute name.
Dev Moved survey not activated warning to view.
Dev Fixed survey completed page being rendered twice.
Dev Renamed all original survey files to prevent accidental rendering of old files during testing.
Dev Always show clear all button in navigator.
Dev Show load / save buttons if saving is allowed. Load button still needs check to see if data is available.
Dev Added questioncount, read from session. These random session readings should be removed, it creates a spaghetti of dependencies.
Dev Always enable twig debugging, even if LS debugging is disabled. Should be removed before stable release.
Dev Added html comments to twig welcome template. This allows for easier checking if Twig rendering is actually used.
Dev Added support for translations using ngettext, use ntrans. Check welcome.twig for example.
Dev Merged branch 2.2: Survey rendering via Twig.
Merge branch '2.1' of github.com:LimeSurvey/LimeSurvey into 2.1