v0.17.0.
Added shortcuts to result objects for some special commands:

- 'MULTI' gets isMulti = 1;
- 'EXEC' gets isExec = 1;
- 'DISCARD' gets isDiscard = 1;
- 'MONITOR' gets isMonitor = 1;
- 'QUIT' gets isQuit = 1;
- '(P|UN|PUN)?SUBSCRIBE' get isSubscription = 1;

On branch master
Changes to be committed:
modified:   lib/commands/connection.js
modified:   lib/commands/pubsub.js
modified:   lib/commands/server.js
modified:   lib/commands/transactions.js
modified:   package.json