Merge pull request #17 from greuze/master

Update project description, that was updated in master directly
Updated manifest with new icon sizes (one is mandatory)
Merge pull request #18 from greuze/updated_manifest_new_icon_sizes

Updated manifest with new icon sizes (one is mandatory)
Initial version handling file events (alert)
Share and delete files (real)
Merge pull request #20 from greuze/task/event_handling

Task/event handling
Merge pull request #21 from greuze/develop

Pull to master this stable version (with list, share and delete completed)