Test if work unit is unannotated

[#45]
Adds the annotation.

Still needs some CSS.

[ #45 ]
Adding a style for the needs-note class

[ #45 ]
Fix spec fail caused by timecop persistence.
Merge pull request #51 from TimePulse/add_unannotated_css_class_to_long_unannotated_work_units_45

Completed