Fix bugs

Hello, I am AlayshChen from China and I am reading your blog. It helps me a lot. When I run the TBCircularSlider I find two bugs.
1. If I don's touch the handle, the handle would still move.
2. If I touch the handle, when I move the handle, it would move to the firstTouchPoint first even though the touchPoint is in the range of the handle.
I only solve the first bug.