Issue #57: Add channel name for context.
Issue #57: Add channel name for context.

When the user is in more than one active game add the channel name to
private messages sent to them.

This change adds the channel name when:

- New White Cards are dealt.

- a new Black Card is dealt.

- Their play is being repeated back to the user.

jshholland/pah-irc,jfautley/pah-irc,grifferz/pah-irc