Incorrect value displayed when 'percentage' is equal to 0 or 1

Progress view displays incorrect value when configured in one of the following ways:

Progress Mode | Clockwise | Percentage
-------------------- | -------------- | ---------------
Deplete | YES | 0
Deplete | NO | 0
Fill | NO | 1

**Before change - 0%**
![before 0](https://cloud.githubusercontent.com/assets/103982/5541351/668fa9ea-8ad7-11e4-991f-b881fa617f0c.png)

**Before change - 100%**
![before 100](https://cloud.githubusercontent.com/assets/103982/5541352/6695edc8-8ad7-11e4-8922-7a4bb10da0e3.png)

**After change - 0%**
![after 0](https://cloud.githubusercontent.com/assets/103982/5541356/93fe2410-8ad7-11e4-9343-beea2fc75f4c.png)

**After change - 100%**
![after 100](https://cloud.githubusercontent.com/assets/103982/5541357/94001d1a-8ad7-11e4-94be-f0c2b29b617a.png)