Pass resource paths to dx

This small modification allows resource paths to be passed to the dx tool. This is important for using local jars that can't be retrieved via leiningen. For example, I wanted to use the [Android Support Library](http://developer.android.com/tools/extras/support-library.html), so I copied the jar file to my project's libs directory and added the following to my project.clj:

>  :resource-paths ["libs/android-support-v13.jar"]