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
You guys set up a convention a long time ago. User interface views go into "WEB-INF/view/jsp/default/ui/". For whatever reason, the default "theme" (if you will) was called "default", and I'd argue was improperly nested before "ui" (e.g "WEB-INF/view/jsp/ui/default/"). It has set a convention... 

Continuing on with this convention and this enhancement, if implementors want to use alternate views based on a registered service's theme, they can clone `default/ui` pages and copy them to `theme/ui` (e.g. `alumni/ui`) and do whatever they want to with the set of views.