Refactor into two Maven projects

* new parent project
* original lib-util as sub-project

sets the stage to add new lib-util-app sub-project
add new lib-util-app sub-project

* use maven-shade-plugin to built lib-util-app jar with embedded dependencies
* move MPBatch main method to new MPBatchApp in lib-util-app
refactor MPBatch to use List instead of Vector
Modify MPBatchApp to use Apache Commons CLI
MPBatch: add display of cumulative time for all threads