Added .gitignore

Added a .gitignore rule for the 'target' directory as a whole.
Added helper class for OS detection

The helper class leverages the System.getProperty("os.name") mechanism
to do basic detection of the operating system.
Packaging and unit tests pass on Ubuntu 13.04 with Oracle 7
Leverage maven-provided JARs instead of requiring local JARs
Removed local copy of the JARs that were moved into pom/maven land
Cleaned up the XML formatting for nbactions.xml
Added 'getting started' instructions to README.md