Blockdiag

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* Add node attribute: linecolor
* Rename diagram attributes:
* fontsize -> default_fontsize
* default_line_color -> default_linecolor
* default_text_color -> default_textcolor
* Add docutils extention
* Fix bugs

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* Add node attribute: fontsize
* Add edge attributes: thick, fontsize
* Add group attribute: fontsize
* Change color of shadow in PDF mode
* Add class feature (experimental)
* Add handler-plugin framework (experimental)

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* node.style supports dashed_array format style
* Fix bugs

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* Add node attributes: width and height
* Fix bugs

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* Fix bugs

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* Replace SVG core by original's (simplesvg.py)
* Refactored
* Fix bugs