Fixes #18.

New ring-swagger has handler which can be used to
server swagger-ui and it provides a way to set uri for api-docs.
Remove dependency on compojure.handler

We now define all middlewares for "apis" ourselves. Before
`compojure.handler/api` has used as base but that namespace uses
multipart middleware which depends on servlet-api which we don't want
to depend on.
Clean project.clj
Merge branch 'feature/swagger-ui-opts'
new version