anchor.diff:  reload your Clojure files from `WEB-INF/classes`.  Here's an example:
   
   [source,clojure]
  +.build.boot
  +----
  +(def gae
  + {...
  +   :filters [{:ns 'migae.reloader   ; REQUIRED
  +              :name "reloader"      ; REQUIRED
  +              :display {:name "Clojure reload filter"} ; OPTIONAL
  +              :urls [{:url "/echo/*"}
  +                     {:url "/math/*"}]
  +              :desc {:text "clojure reload filter"}}]
  +  ...}
  +----
  +
  +[source,clojure]
   .migae/servlets.clj
   ----
  +;; DO NOT EDIT THIS FILE
  +;; autogenned from build.boot and template
   (ns migae.servlets)
   ...
   (gen-class :name migae.reloader
  
positive.code: ----
  
  To make this work, all you need to provide is the `migae/reloader.clj`
  file and set the configuration map.  The `WEB-INF/web.xml` files will
  be autogenned as explained in <<config>>, and the
  `migae/servlets.clj` file will be autogenned, aot-compiled, and
  discarded, as explained in <<servlets>>.
  
negative.code: .WEB-INF/web.xml
  ----
    <filter-mapping>
      <url-pattern>/echo/*</url-pattern>
      <filter-name>reloader</filter-name>
    </filter-mapping>
    <filter-mapping>
      <url-pattern>/math/*</url-pattern>
      <filter-name>reloader</filter-name>
    </filter-mapping>
    <filter>
  