Svgwrite

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* alpha version
* removed 'attribs' parameter from all constructors
* new elements: Set, Animate, AnimateMotion, AnimateColor, AnimateTransform, all filter elements
* added set_desc(title, desc), set_metadata(xmldata) to BaseElement class
* moved content of interfaces.py to mixins.py, (ITransform -> Transform and so on)

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* alpha version
* new elements: Marker, ClipPath, Mask
* paint service: LinearGradient, RadialGradient, Pattern

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* alpha version
* validator rewritten as validator2.py
* debug and profile options separated for each drawing object
* important change: create objects with factory functions of the *Drawing* class: drawing.<svg-elementname>(...)
* added mixins for setting stroke and fill properties
* new elements: Hyperlink, Image, TextArea,

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* alpha version
* new elements:

* basic shapes: Line, Rect, Circle, Ellipse, Polyline, Polygon, Path
* text elements: Text, TSpan, TRef, TextPath
* container elements: Group, Symbol, SVG, Use, Defs

* for examples see: examples.py