Separate the resource implementation from the router implementation of
`txspinneret.route.Router`.
Implement `txspinneret.resource.SpinneretResource` as an
`ISpinneretResource` adapter to `IResource`, instead of subclassing
`twisted.web.resource.Resource`.
Update documentation.
Tests for `txspinneret.resource._renderResource`.
Make the README clear that Spinneret is teething.
Some README love.
Don't use the global adapter registry.
Fix example.
Test coverage.
Minor docstring improvements.
Merge pull request #6 from jonathanj/6-spinneretresource-wrapper

Make `SpinneretResource` a wrapper and separate `Router` from `IResource`. (closes #6 and #5)