WIP: Differences between spec and current state of Morsel

Looks like some things that used to work before [hackerschool/webstack.jl](https://github.com/hackerschool/webstack.jl) got split up, some (less friendly) changes to parameter access, some TODOS, some typos, and some user-defined functions mixed in for color?

My guess is that `redirect` should be opened as an issue. Anything else?

Related to #12.