Updates to request, added parameterbag, parameterbagreadonly + tests

 + Added ParameterBag for holding parameters
 + Added ParameterBagReadOnly which will _not_ update values : its read only!
 + Added test for parameterbag*
 + Uppdated request, now has ->query for _GET, ->param for _POST, ->params
   for merge of _GET, _POST, ->body for raw body data and ->files for _FILES