Updated README.md.

Added contributors. Updated games list, instructions and Freenode webchat
link.
Removed post-bet command display messages.

This reduces channel clutter.
Small fix in help files.

Removed parameter for "settings" help entry.
Changes to game out for poker games.

Added a pre-flop output that verbosely describes button and blinds.
Combined stacks and stack changes into one output message.
Merge branch 'testing'