render now also skips nil pointer arguments

standard error hook now returns valid html

Merge pull request #2 from advanderveer/v0.1

Major refactor V0.1

now have type for OnError func

removed logger and error factories for a single OnErrorRender hook

contextual outputs are now also use hooks

added ContextOutput for contextual outputs

now use error.html as the default error template

no longer gives 500 status on skip encode

no longer gives 500 status on skip encode