Modified build.xml to only pull in workbench dependencies when building workbench, and to exclude gui classes from the mondrian.jar.
Separated the runtime dependence on mondrianschemaworkbench-plugins so that it's only pulled in during workbench-dist creation, avoiding circular dependence when creating the workbench.jar.
Merge pull request #125 from mkambol/workbench

[MONDRIAN]  Changes to support building mondrian w/o bringing in workbench dependencies (e.g.kettle-core),