clear home ws with prompt to save unsaved changes
remove changes related to another task
small code improvement
separate UnsavedWorkspaceChangesHandler on model and view layers; relocate "New" button
Merge branch 'clearing-home-ws' of https://github.com/marimano/flood into clearing-home-ws

Conflicts:
	app/scripts/models/UnsavedWorkspaceChangesHandler.js
Merge pull request #89 from marimano/clearing-home-ws

REACH-93 Create new Home workspace in nwk