Re-introduce Java Packages and add bash scripts for Golden Master testing

Java packages are back
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I found that when I was doing the kata in java, I wanted to pull out some of the classes I'd extracted into their own package. This was not possible because some of the original classes were in the default package, and a class in a package can't import from the default package (not in Eclipse, anyway). When I'd worked on this kata in the past, the source code started in the `com.gildedrose` package. I've re-introduced this package and moved the classes to it. I've also updated the test reference in `config.gr` to match.