Remove unnecessary lines from createNavItem
Refactor baseAngle and sliceAngle. Move them to navItem from core.
New wheelnav properties: navItemsContinuous, navItemsCentered
Change navItem.click to navItem.mouseup, fixed #8
Improve rotate mode, closed #7
New wheelnav properties: rotateRoundCount, animateRepeatCount, animatetimeCalculated
Move default settings from navItem to core.
1.1.0