Improved predicions validation.
Improved match expiration checks.
Navbar updates. Added username to profile form.
Improved ranking.
Removed old code.
Minor style updates.
Merge pull request #31 from matiasb/more-fixes

More UI fixes.
Using cursor instead of manager.
Fixed ranking template.
Minor ranking view update.
Merge pull request #32 from matiasb/ranking-information

Improved ranking stats.