0.5.4-4 added :preloads compiler option

• added validation support for :preloads compiler option
• ! removed compojure as a dependency
  Figwheel used compojure in its server to handle routing
  this was overkill. It complicated the routing while adding an unneeded dependency.
  Strange things where happening when wrap-reload was being used in an
  embedded :ring-handler.
  There is so little routing functionality in figwheel that I just created
  what was needed with simple ring middleware. If the behavior of your
  :ring-handler changes (routes not being resolved, bad headers etc.)
  please let me know. For reference here is the commit:
  f027b10
• improved the resiliency of the plugin around bad initial config data.
  The lein plugin uses config data from the project.clj before it has been
  validated, I added some extra safe guards to protect against start up errors