Allow dimensions for bundles

[GoogleCodeExporter]

This enhancement is for experiments where dimensions are not independent. 
Consider the case that we want to create a bundled dimension and one parameter 
has a huge number of possible combinations. The other parameters are not 
affected by the additional parameters.
E.g.:
Dimension.createBundle("ranker",
new Object[] {
"rankerClass",  Ranker0},
new Object[] {
"rankerClass",  Ranker1,
"rankerParams",  Param4Ranker1});
There are two rankers but only Ranker1 needs parameters. If there are many 
possible parameters, they have to be added manually.

Proposed solution:
Param4Ranker1 could be an dimension inside this bundle. It could also be a list 
or array of objects that create a parameter space for Ranker1 only.

Original issue reported on code.google.com by nico.erbs@gmail.com on 14 Sep 2012 at 10:54