Add styling for left half of timer pie

* It can be displayed minutes from 1 to 60 minutes now.
Enable timer to display negative minutes

* The property 'data-minutes' can now contain values from 1 to 60 minutes
  and from -1 to -60 minutes.

* Negative minutes are displayed in warning color.
Add minutes as text to timer pies

* If minutes are negative, the text is displayed in warning color.
Enable timer to display minutes >60 and <60

* Timer pie is filled completely for minutes >= 60 and <= 60.
Use jquery and underscore templates to generate documentation

* Instead of copy paste timer pies html for documentation, use jquery and
  underscore templates to generate different timers for documentation.
Include grid system