fix FEELPP_PROJECTS_DIR variable
Merge branch 'develop' of https://github.com/feelpp/feelpp into develop
up #334
Up EXAMPLE_PATH to include snippet when document project
Merge branch 'develop' of https://github.com/feelpp/feelpp into develop
fix error in inf norm
Merge remote-tracking branch 'origin/develop' into feature/doc

Conflicts:
	doc/api/Doxyfile.in