#2 Improve build script

[Chris Wolf]

- refactor Ant build.xml to keep all build artifacts under the "build" dir to not contaminate the top level directory
- add "help" target in Ant build script
- create jar manifest in-line so file is not needed
- change jar naming to follow conventions
- change some target names to follow conventions
- restructure source dirs to follow Maven convention (also separate test code)
- implement Maven build script (pom.xm) (needed for pushing to internal Maven repo)

[Chris Wolf]

Updated project's Ant build.xml and added Maven pom.xml