Rounding of coordinates decreased from 4 to 3 numbers after the decimal
point.
Added removing of tiny segments.
Added removing 'z' segment, when it's don't needed.
Added removing unneeded, non-style attributes from circle and ellipse.
Removed converting of rounded rect into path , because path always
bigger.
Added joining of style properties into 'style' attribute as tool.
3.5% better cleaning