CAS-1425: aligned view names to match the jsp filename

Some view names in default_views.properties have been updated to match the file names of the jsp's. The respective view names in the login-webflow.xml have been updated as well. This pull fixes https://github.com/Jasig/cas/issues/490
I don't see the statisticsView/Controller being much different than the healthCheckController with a hard coded view embedded in the code. On a previous commit this was the only view in the UI view mapping. But it's not really UI but isn't a Protocol view either. Would you like me to revert this code and put it in the protocol mappings? Or go back further or return to a one entry `default_views.properties` file? 

I welcome your thoughts?