Split the current single repo into several separate modules

The current repo (https://github.com/jberet/jsr352) contains many separate sub-projects (e.g., jberet-core, jberet-support, jberet-schedule, etc). Need to consider split it into separate, more modular repo's for better organization and management. It will also give more visibility to these sub-projects when located in their own repository.

Reference:
https://stackoverflow.com/questions/359424/detach-move-subdirectory-into-separate-git-repository
https://help.github.com/articles/splitting-a-subfolder-out-into-a-new-repository/#platform-mac