Purge rollup files and update build.xml Core should not contain rollup files any more. All my modules that live in shared src directories have a new build.xml file that subants the build.*.xml files in that dir and passes along the requested target.

Moving ArrayList into collection module. collection is now a rollup of new submodules array-extras, arraylist, arraylist-add, and array-invoke. Added API docs for all submodules.

Added collection module. This is a place to put additional collection utils that we don't want in the core (to keep file size reasonable)