Make the problem statistics use color to indicate attempts and correctness.
Modified the datepicker button a bit

- Uses the calendar icon instead of "C"
- In math4 the button is attached to the input.
Merge branch 'release/2.8' of http://github.com/openwebwork/webwork2 into newbutton2

Conflicts:
	htdocs/themes/math4/math4.css
Merge pull request #214 from jasongrout/color-stats

Make the problem statistics use color to indicate attempts and correctness
Merge pull request #216 from goehle/newbutton2

DateTimePicker Button
Merge branch 'doublestar' of https://github.com/goehle/webwork2 into doublestar
Changed mathview so switiching focus closes popups

fixed minor bug with an extra 1 being displayed on Past Answers