WIP: Feature/234 continuous delivery

This is a work in progress merge request for continuous delivery.

After removing the university scene and tests & demos subdirectories we can create a package that is uploaded to bintray and is downloadable via conan install phx/17.12.0@RWTH-VR/stable -r rwth-vr--bintray.

This is work in progress as there are still some warnings to fix and it's not tested well.

One question: Shall we do the update via a nightly build?

demos/viewer/src/viewer.cpp

@@ -84,7 +84,7 @@ int main(int, char**) {
   });
 
   phx::SceneLoader::InsertModelIntoScene(
-      "models/UniversityScene/Univers20171013.obj", scene.get());
+      "models/bunny.obj", scene.get());
 
   std::vector<glm::quat> light_dirs{
       glm::quat(glm::angleAxis(-0.25f * glm::pi<float>(), glm::vec3(1, 0, 0))),