Svg-charts

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* Fixed bug in rendering of Pie Chart styles.
* Improved testing framework. Now samples are at least generated as part
of the test suite.
* Fixed bug in javascript when label ids had spaces. See 3139197.
* Fixed build issue where package data wasn't included due to 2to3
technique. Now using distribute technique and installation on Python
3 requires distribute.

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* Fixed bug where x axis labels would not be rendered properly if the
largest value was the same as the largest visible x value on the
chart.

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* Altered the way CSS files are loaded, so they can be more easily
customized by subclasses (and less dependent on the class names).

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* A small attempt to improve the documentation - added links to examples
that already exist.

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* Fix IndexError in ``svg.charts.plot.Plot.field_size`` when there are
only two values returned by float_range (in the case there are only
two different 'y' values in the data) and scale_y_integers == True.
Credit to `Jean Schurger <http://schurger.org/>`_ for the patch.
* Fixed problem in setup.py installing on Unix OS (case sensitivity of
readme.txt). Credit to Luke Miller and Jean Schurger for supplying
a patch for this issue.

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* Updated cssutils dependency to 0.9.6 (currently in beta) to require the CSS profiles support.
* Completed an SVG CSS profile according to the SVG 1.1 spec.