Start tests utils.
test: Unify variable name.

* tests/utils: Here.
test: More test for ls.

* tests/ls.test: Here.
du: Fix help message options.

Closes #84.

* src/dctc/java/com/dataiku/dctc/command/Du.java: Name clash.
Include compress library in the self package

Closes #85.

* build.xml: Here.