Knob stops responding when value is greater than defined maximum

[jakubhlavaty]

1. let's have a knob with a defined maximum value (options.max)
2. pass a value that's less or equal to the maximum value
3. knob updates
4. pass a value that's greater than the defined maximum
5. knob updates to this value, but successive updates don't do anything (knob is frozen - doesn't react to changes to the value)

I would expect, that the value is either

• displayed regardless of the maximum value
• OR truncated to the maximum value
  and the arc shouldn't grow beyond the defined angles.

Here's a simple project that demonstrates this (it updates with a timer so just wait for it to freeze):
https://github.com/jakubhlavaty/ng-knob-bug

• run sample with npm (see readme)
• dependencies managed with bower (using ng-knob 0.1.3)

[jakubhlavaty]

Created a pull request. Please review.