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 think this is starting to get complicated, and will be error prone (space-pipe-space). configobj will read list values (comma separated). Maybe we should leverage that functionality, and make a note that typically each value should be quoted (bean names will typically include ",").