Release 0.3.4
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All:
       Display result of comparison to reference file in test suite.

SVG:
       Use cairo API for filter implementation when possible.
       Fix blur misposition.
       Support for filter primitive subregion.
       Implementation of <feTile>.
       Implementation of BackgroundImage and BackgroundAlpha.
       Implementation of <switch>.
       Reimplement group opacity optimisation.
       Implementation of get_extents for <polygon>, <polyline>, <ellipse>, <line> and <text>.
       Add support for HSL color syntax.
       Fix parsing of stroke-dasharray when value are separated by spaces.