Remove unused wrapping .system-folder class

* Alphabetize attributes for .system-caret
Display locale timestamp for task updatedAt

Using JavaScript’s `Date.prototype.toLocaleString`, the timestamp is
displayed in the user’s preferred locale format without using another
library.

Add `title` attribute so hovering the time gives the ISO timestamp.
Merge pull request #323 from mesosphere/locale-timestamps

Locale timestamps
Adding health checks to the task list UI, WIP
Extending the state machine with no tasks state
Moving key to correct element
Adding default health message
-Reverting state machine extension in TaskList
-Adding StackedViewComponent to handle task detail
-Adding TaskDetailComponent
-Moving controlling functionality from AppModal
to TaskList
Adding more robust health message
Adding more detailed task details
Adding footer only on task list/configuration view
Adding taskViewComponent as controller of the task
list
Handling null results
Moving polling to AppModalComp
Adding health checks to the task list UI, WIP
Extending the state machine with no tasks state
Moving key to correct element
Adding default health message
-Reverting state machine extension in TaskList
-Adding StackedViewComponent to handle task detail
-Adding TaskDetailComponent
-Moving controlling functionality from AppModal
to TaskList
Adding more robust health message