Mini clean up of handling for chunked encoding
Fix server_test
Add an "Unbind" method to the Binders, which serializes Go values to URL formats.

Also unify the numerical binding funcs.
Reverse Router that can handle arguments

Generates router funcs in app/routes for each Action.  These take the
same (partially-typed) arguments as the action itself, and they return
a URL to invoke that action with the given arguments.
chunked encoding + dev mode = render to a temp buffer anyway
Update template reverse router to use Unbind