Updated package info with more details on Builders
Tweaked ant build file
Minor tweaks to ParamCfg

- Added some javadoc comments.
- Use Range.EMPTY instead of Range.getInstance()
Removed redundancy in Unit
Updated ant build file

Now easy to specify to a test case to run.
Added new assertions to Unit

- String contains all.
- String contains none.
Added an XML helper
ParamCfg can now produce XML
Minor cleanup

Removed unnecessary imports.