add renderToSVG function (closes #28)
add a bunch of Haddock documentation to Diagrams.Backend.SVG
minor style and documentation cleanups
expand Haddock documentation in Diagrams.Backend.SVG.CmdLine
general minor cleanup in Graphics.Rendering.SVG
bump version to 0.6.1
minor documentation tweak
Put more thorough documentation in .cabal description field.
Merge pull request #29 from diagrams/svg-cleanup

General SVG backend cleanup, additional documentation, and new API function