feat: progress

Indeterminate progress bar feature added. HTML and Scss done.
feat progress: enhance existing circular progress
feat progress: create service to manage progress
chore demo: include progress
refactor notifications: move into services folder

A new services section has been created. Notifications have been moved
inside from the directives section.
chore dist: update
refactor progress: write service with an API

The service contained a mix of function and unnamed function. This commit rewrite all of
them into function with an API returned at the end of the service.
chore dist: update
Merge pull request #2 from lumapps/feat/progress

feat progress: add circular and linear progresses