Seed: allow announce field with trackers disabled

[dcposch]

Creating a WebTorrent client with the {tracker: false} option means it doesn't talk to trackers -- only (potentially) the DHT and web seeds.

However, creating a torrent using .seed() should still work normally, and the resulting torrent's announce field should be the same as it would normally be.

[dcposch]

@feross thoughts?

[dcposch]

What does this error mean?

1..170
# tests 170
# pass  170
# ok
events.js:160
      throw er; // Unhandled 'error' event
      ^
Error: connection refused: localtunnel.me:36746 (check your firewall settings)
    at Socket.<anonymous> (/home/travis/build/feross/webtorrent/node_modules/localtunnel/client.js:84:32)
    at emitOne (events.js:96:13)
    at Socket.emit (events.js:188:7)
    at emitErrorNT (net.js:1271:8)
    at _combinedTickCallback (internal/process/next_tick.js:74:11)
    at process._tickCallback (internal/process/next_tick.js:98:9)
npm ERR! Linux 3.13.0-40-generic
npm ERR! argv "/home/travis/.nvm/versions/node/v6.6.0/bin/node" "/home/travis/.nvm/versions/node/v6.6.0/bin/npm" "run" "test-browser"
npm ERR! node v6.6.0
npm ERR! npm  v3.10.3
npm ERR! code ELIFECYCLE
npm ERR! webtorrent@0.97.1 test-browser: `zuul -- test/*.js test/browser/*.js`
npm ERR! Exit status 1
npm ERR! 
npm ERR! Failed at the webtorrent@0.97.1 test-browser script 'zuul -- test/*.js test/browser/*.js'.
npm ERR! Make sure you have the latest version of node.js and npm installed.
npm ERR! If you do, this is most likely a problem with the webtorrent package,
npm ERR! not with npm itself.
npm ERR! Tell the author that this fails on your system:
npm ERR!     zuul -- test/*.js test/browser/*.js
npm ERR! You can get information on how to open an issue for this project with:
npm ERR!     npm bugs webtorrent
npm ERR! Or if that isn't available, you can get their info via:
npm ERR!     npm owner ls webtorrent
npm ERR! There is likely additional logging output above.
npm ERR! Please include the following file with any support request:
npm ERR!     /home/travis/build/feross/webtorrent/npm-debug.log
npm ERR! Test failed.  See above for more details.
The command "npm test" exited with 1.

Tests pass in Node but fail in the browser (zuul).

[feross]

Why are you using false and [] inconsistently?

[feross]

What does this error mean?

It's just the tunnel server crashing, which happens unfortunately often. Not your fault.

[lock]

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