A simple rounded progress view for OS X.
Customizable properties:
/// The current progress shown by the receiver.
@property (nonatomic, assign) CGFloat progress;
/// The line width of the receiver progress bar, defaults to 3.0f.
@property (nonatomic, assign) CGFloat progressLineWidth;
/// The progress line color, defaults to light gray.
@property (nonatomic, strong) NSColor *progressLineColor;
/// The line width of the receiver background bar, defaults to 6.0f.
@property (nonatomic, assign) CGFloat backgroundLineWidth;
/// The background line color, defaults to dark gray.
@property (nonatomic, strong) NSColor *backgroundLineColor;
/// Specifies the basic duration of the animation, in seconds, defaults to 0.4.
@property (nonatomic, assign) CFTimeInterval duration;