Link folder icon to folder instead of parent folder

Fix #115
Try to link folder names to folder instead of the parent
Make ParameterHelper non static, so we can inject the Files\View
Only use public classes
Inject objects into datahelper
Inject objects into GroupHelper
Make Data::read() and others non-static
Make getNotificationTypes() non-static
Do not delete the installed_version so Files\View works as intended
No scrutinizer for l10n + tests
Merge pull request #118 from owncloud/issue/115

[Issue/115] Link folders to the actual folder instead of the parent