Add some stats

[precipice]

Would be fun and maybe useful to have some stats show up at the end of the export:

• Transcripts exported
• Uploads exported
• Deleted uploads
• Errored uploads
• Longest run of days in the room
• Most posts by a user
• Longest time in the room

[bgreenlee]

Posts by user:

egrep -rh --include=transcript.txt "^\[.*?:\]" campfire/ | perl -pe 's/^\[(.*?)\s*(pasted|played a sound|uploaded|tweeted)?:\].*/\1/g' | sort | uniq -c | sort -nr