fix link to README and bump version to 0.6.0.1

Thanks to David Virebayre for the report.
add 0.6.0.1 to CHANGES
Fixing links to issues in README
Update deprecated 'colorToRGBA' to new name 'colorToSRGBA'.

See diagrams/diagrams-lib@bfc8be9.
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
Enable Travis IRC notifications
clean up pragmas, imports, whitespace
derive Show instance for Options SVG R2
bump upper bounds to allow base-4.7 and unix-2.7
Travis: install dual-tree and monoid-extras from Hackage
Travis: cabal update before installing
re-export SVG type from CmdLine module