Playback for these shapes' intermediate steps no longer works. The final result is simply shown. This must be fixed.

- Comparison between string and float fix to string.to_f and float.
- Page previously drawn are cleared when new pages are cleared.

It is still buggy, and has some issues that need to be further investigated with not showing the correct page. Also, the code is far from efficient or elegant. This is more of a hacked-together proof-of-concept solution to the problem. The solution has been found, and it is in the works, this is a beta version of what has been created so far. Proceed with caution on this commit. It may have also inadvertently broken other parts of the code as well.

There are some issues still:
	(1) The playback replays all of the rectangles and does not clear those that are simply resizes of previous rectangles. This will need to be recoded in writing.js
	(2) The rectangles are filled in. Simply set each rectangle style to fill:none within the slides.rb processing script.

TODO:	Clear full screen
	Draw circles
	Draw lines in larger sections (with many subsections)
	Change Slides
	Start moving cursor
	More rigid code for playback with issues getting the svgs