New macro to convert a vector of strings into a hash-map with proper keywords

* handler.clj (get-uid-field): New function to generalize `get-uid-pass`.
(vec-to-kv-hmap): New macro to convert a vector of strings into a
hash-map with proper keywords.
(get-initiatives, show-user): Use the new macro.
(app-routes): New test route to show user's info.
Merge branch 'master' of github.com:bzg/meme