Fixes README formatting
Change invocation of main python file.

Now accepts server url, database name, database user, and logging level
as command line arguments.
README minor modifications
Fix game.py when running bot in training mode.

Training bots lack heroId and elo fields, so we want to avoid a KeyError
when accessing those fields.
Remove rawJSON field from Turns table, and deactivate previousId columns
on Turns and Mines tables

All changes done in the name of speeding up the Inserter so it doesn't
take longer to insert a game then it takes for a game to run.
Remove previousId from Turns, Heroes, and Mines tables.

The last patch disabled it, now this patch actually removes the columns
from the SQL file and the code that fills in the previousId fields for
Turns and Mines. The Heroes' previousId field was never being set, so
there's nothing to remove from the code.
Merge branch 'master' of https://github.com/DuskEagle/vindinium-game-statistics

Conflicts:
	README.md