Re-add the ability to specify the destination subreddit for subreddit_stats output.

[dziban303]

I use subreddit_stats monthly on several subreddits I moderate. I'd like to be able to specify to which subreddit the stat output will be posted, rather than having all of them posted to /r/subreddit_stats. As it stands, I must go to the post in /r/subreddit_stats, copy the text, and submit it again to the appropriate subreddit. Another problem is that reddit forces me to wait ten minutes between subreddit_stats runs, which makes running a batch script impossible.

Re-adding the ability to specify the target subreddit as a command line switch would take care of both of these problems at once.