Added support for custom button texts + Added support for deleting markers + reworked the way the "+" and "-" buttons work + Added a "placeholder" marker when clicking "+" to show where in the timeline the marker will be posted
/** @constructor */
function Circle(){}
/**
@constructor
@memberOf Circle#
*/
Circle.prototype.Tangent = function(){};
// renaming Circle#Tangent to Circle#Circle#Tangent
/**
@memberOf Circle#Tangent#
*/
Circle.prototype.Tangent.prototype.getDiameter = function(){};