Do not allow registration of games where the two players are the same player (e.g. Adam vs. Adam)
Support inserting of old games (i.e. recalculate all newer games' results)
Only store actual game and player data. (Don't store current standings)

Updated README.md.
Calculate and display current standings.

Added a new class (StandingsCalculator) for calculating game standings and player scores.
This new class is populated with all game and player data and then figures out all the details.
It is then used to display more detailed information in the overview template.