Svgelements

* Corrects Issue 95. Multiple Reification of Stroke-Width for Skewed Matrices.
* Gives `Group` a static function for bbox.
* `Color` now can use long and correct for it rather than cheating and keeping shorts.
* `Color` accepts String of integer.

Enacting very temporary support of Python 2.7. Merry Christmas!

This will be removed from the next version. (though the code will likely not be changed).

* Fix a small Fill Opacity bug.

* Adds ClipPath
* Adds SVG Fill/Clip Rules
* IRI Parsing
* Stoke-Width to first class parsed citizen of all Graphics Objects
* Groups are Transformable
* Transformable operates on stroke width
* Stroke width is processed like real Length/Percentage
* Corrected Width and Height when ViewBox is not added for percent based objects. (These must use the Width and Height given to construct a non-scaling transformation, but also not overwrite the width or height with None).
* Corrected Edge case Def Use Use nesting which pushed the second nested Use to the regular dom.
* Corrected Use Use Styling objects. Now propagates the shadow-dom node sequences.
* Added render() as common function among all objects, since Length objects are pretty common.
* XY values are set specifically on SVGImage objects.
* Desc added. SVGDesc is deprecated.
* Added Title element.
* Stroke Width elements set to 1 by default. Per spec.
* Capped shadow dom recursion stops working if infinite loop occurs.

Numpy in header was too inclusive. Moved the includes to the npoint blocks, so it will not try to do the include if the program being used doesn't try to use those features.