Upgraded Compojure to 1.2.1.
Refactored let bindings out of views.clj and into core.clj. There's
still a lot of redundancy which can be solved by rolling bindings up
into a macro / perhaps a fn.
Flesh out authorized-link? Clean up random comments. Reorganize
code in views.clj and schema.clj. Delete unused private function
get-username-from-request-map in views.clj. Delete unused debug
function. Add default response for newly added product with no price data.