Refactor fragments layout

[kavi87]

In order to allow better scalability a major refactoring of w20 fragments is necessary. The framework will be splitted into multiple repositories:

• w20: Will contain the loader, core modules and some modules from ui (ui.js, notifications.js)
• w20-components: Will contain all the ui components from fragment ui
• w20-dataviz: Will contain the modules of the dataviz fragment
• w20-material: Will contain angular-material dependencies
• w20-bootstrap-3: Will provide Bootstrap 3 and utilities such as angular-bootstrap
• w20-bootstrap-2: Same as above for Bootstrap 2