params support:
- add support for params to HistoryHash in addition to existing support for History
- better management of default params on the view not on controller/config
- always set up the params in the Load controller instead of splitting the work between Load & Transition  controller
make sure opts is always used on transition events to carry params
fix defaultParams on views by making sure no params means a null params parameter + fix modelApp to test defaultParams
fix issue #142
Merge pull request #141 from cjolif/master

Pull request for issue #73, support of params in HistoryHash