beetwerk crashes, when the network connection goes down

[robotanarchy]

Here's the output:

Temporary upload folder: /data/.beetwerk-temp
Server started, listening on port 1234

events.js:72
        throw er; // Unhandled 'error' event
              ^
Error: read ECONNRESET
    at errnoException (net.js:904:11)
    at Pipe.onread (net.js:558:19)
nodejs beetwerk.js  595.46s user 255.10s system 0% cpu 90:32:42.93 total

[robotanarchy]

Added some code that should prevent the crashes for now, but print out more debug info instead: 012b271.

We should clone this code to the server in our hackerspace, that runs beetwerk and then keep it running for a week or so, until the error appears.

After that, we might be able to explicitly catch this error and print out something like:
NOTE: Connection has been reset - has your IP changed?

CC: @sqozz (who pointed me to the bug in the first place)