[ALIEN-447] Hopscotch service improvements and creation of the application list screen help tour.
Merge branch 'develop' of https://github.com/alien4cloud/alien4cloud into develop

Conflicts:
	alien4cloud-ui/yo/app/index.html
[ALIEN-453] Recreate artifact repository if removed.
Merge branch 'develop' of https://github.com/alien4cloud/alien4cloud into develop