Use Presenter for app navigation.

Use Presenter for app navigation.

This is the proper way to deal with Place (URL) changes with the MVP
framework.

* src/main/java/org/glom/web/client/ClientFactory.java:
* src/main/java/org/glom/web/client/ClientFactoryImpl.java: Remove
PlaceHistoryMapper and PlaceHistoryHandler.
* src/main/java/org/glom/web/client/OnlineGlom.java: Re-add
PlaceHistoryMapper and PlaceHistoryHandler.
* src/main/java/org/glom/web/client/activity/DocumentSelectionActivity.java:
Don't use getHistoryMapper().getToken(place) to create the hyperlinks.
* src/main/java/org/glom/web/client/ui/DocumentSelectionView.java:
* src/main/java/org/glom/web/client/ui/DocumentSelectionViewImpl.java:
Add Presenter interface and setPresenter methods. Rename addHyperLink
to addDocumentLink taking only the document title as a parameter.