Code cleanup, bug fixes and tweaks.

- code cleanup
- removes unneeded Controller instances. Moved ResultSet-related logic
to ResultSetUtil
- removes Posts from User, adds an int for the postCount instead
- renames DummyProvider to Provider
- fixes the breadcrumb navigation on all pages
- fixes all links and content display
- limits "Latest Posts" and "Last Threads" on the user page to 5 
- renames all the id-related GET parameters to "id"
- layout tweaks

Change-Id: I57b57fe7c348ab1177b0808c33aa9c6116154b1f