the now obsoleted options.fps, by Gergely Imreh
 * v1.11: options.grid.sharpLines option added, by @drewnoakes
 *        Addressed warning seen in Firefox when seriesOption.fillStyle undefined, by @drewnoakes
 * v1.12: Support for horizontalLines added, by @drewnoakes
 *        Support for yRangeFunction callback added, by @drewnoakes
 * v1.13: Fixed typo (#32), by @alnikitich
 * v1.14: Timer cleared when last TimeSeries removed (#23), by @davidgaleano
 *        Fixed diagonal line on chart at start/end of 