Add regex bean matching, and regex key search/replace to normalize names

This patch adds two more config items to the JolokiaCollector.conf
mbeansre:  works like mbeans: but matches with regularexpressions
rewrite: which allows rewrite pairs in order to rename collected keys before data is passed to the handler
I believe the setDocExample method actually fills in the documentation. We should only do this once, inside test_should_work_with_real_data. Let's remove this call here.