Svg-charts

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* Removed support for ``compress`` flag on Graphs.
Simply invoke ``zlib.compress`` on the data if needed.

* ``Graph.burn`` now returns the rendered SVG as a
Unicode string without XML declaration and without
pretty-printing. To customize the XML rendering,
override or replace the ``Graph.render`` static method.

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* 17: Fix issue in subclassed Line charts.

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* Minor tweak to README for better rendering in PyPI.

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* Update docs link.

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* 16: Restore support for passing iterable data elements.

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Issue 14:

* ``svg.charts.plot.Plot``
(and hence its subclass ``svg.charts.time_series.Plot``)
now accept data as a sequence of pairs. Example::

import svg.charts.plot

g = svg.charts.plot.Plot()
g.add_data(dict(title='Example',
data=[(1, 1), (2, 4), (3, 9)]))

* data point labels that are drawn when
``show_data_values = True`` can have their label changed
from the default (which is the y-value) by giving a data item
a ``.text`` attribute.
It is convenient to used ``namedtuple()`` for this::

import svg.charts.plot
from collections import namedtuple

Datum = nametuple("Datum", 'x y text')

g = svg.charts.plot.Plot()
g.add_data(dict(title='Example',
data=[Datum(1, 1, 'first'),
Datum(2, 4, 'second'),
Datum(3, 9, 'third')]))

(in fact data items can have any extra attribute;
only ``.text`` is used currently)