remove github-linguist dependency. error out on attempt to use syntax filter w/out linguist
update readme with syntax highlighting instructions
changelog note about removing github-linguist
bump version to 0.0.7
Merge pull request #35 from jch/optional-linguist

Remove github-linguist dependency
Merge branch 'master' into feedbin
Added AbsoluteHrefFilter.
Merge branch 'absolute_link' into feedbin