Removing TemplateEngine, will be replaced with Twig

Core::TemplateEngine is quite old and never tested. It will be replaced
with a new template engine implementing Twig by SensioLabs.
See: http://twig.sensiolabs.org/
Merge branch 'master' into header-move

Conflicts:
	CMakeLists.txt
	src/nuria/templateengine.hpp
	src/templateengine.cpp