Toyplot 0.6.0

• Unicode text wasn't handled correctly by text marks.
• Added an experimental matrix visualization using table axes.
• Added a "title" property for table cells.
• Fix inconsistencies in our use of alignment-baseline and text-anchor CSS properties.
• Added a new section to the user guide on the convenience API.
• Allow real-world units for canvas layouts, and tweak the parameter order for corner layouts.
• Expanded user guide documentation on canvas layouts.
• Added table axes regions for all four sides and corners, plus a property to access every cell in a region.
• Added automatic conversion from numpy NpzFile to toyplot.data.Table.
• Added experimental support for graph visualization.
• Allow toyplot.data.Table initialization from a sequence of 2-tuples.
• Cairo backends were ignoring -toyplot-anchor-shift.
• Cairo backends didn't handle all supported alignment-baseline values.
• Added matrix and table visualizations to the convenience API.
• Added accessors for shape, row count, and column count for table axes and regions.
• Added toyplot.locator.Integer, and a step parameter to control labelling for matrix visualizations.
• Always return a unicode string from toyplot.canvas.Canvas.repr_html(), for compatibility with Jupyter / IPython notebooks running Python 3 kernels.
• Assign a sensible default filename for CSV downloads, for browsers that support it.
• Added a contributed Conda build recipe.
• Allow toyplot.data.Table to be initialized from a 2D numpy array.
• Rename the toyplot.axes.Table "title" parameter to "label" for consistency with the other axes.
• Added a new "Labels and Legends" section to the user guide.
• Added a new "Tick Locators" section to the user guide.
• Added experimental toyplot.data.contiguous() function to identify contiguous ranges in an array.
• Fix a problem with interactive Y coordinates when using a log scale that straddled the origin.