Psyleague

* games can now store additional custom data (per test or per player):
- you can use test data to recalculate ratings on a subset of games (via show --filters)
- you can display player data on the leaderboard (check out the config file for more information)
- play_game script now uses a new JSON format and allows for returning multiple games; old format has been removed
- .games file: format changed to JSON
- see readme.md for CodinGame-specific play_game script example that uses the new standard and allows for easy data extraction
* run: -w/--workers N overrides the number of workers set in the config file
* bot show: -s/--resample N displays the ranking using bootstrapped (resampling with replacement) with N games
* bot remove: removes a bot along with all games and recalculates the entire ranking (execution might take a while)
* bot update: -n/--new_name renames bot (this is only partially supported as this doesn't change the bot executable file; warning: can be slow as it updates the whole .games file)
* bot stop/remove: you can stop/remove multiple bots by specifying a comma-separated list of names
* some bugfixes and better error checking in a few places

* add support for retrieving error data (requires update of play_game script!)
* run: can run a fixed number of games with --games
* show: support for custom leaderboard, new leaderboard config option defines columns to show
* show: you can see bot's creation date, change the format with date_format config option
* show: --limit -> --best
* show: added --recent to show the most recent X created bots
* bugfix: psyleague show --active had no effect
* bugfix: logs show your local timezone now

* bugfixes: psyleague config, psyleague bot update -d, installation, linux support

* initial version