Tor Always Mode Sometimes Hangs

### Step 1: Please describe your environment

* ZeroNet version: 0.6.0 rev3161
* Operating system: Mac OS Sierra
* Web browser: Tor Browser
* Tor status: always
* Opened port: no
* Special configuration: none

### Step 2: Describe the problem:
Sometimes I get this message repeatedly when I look at Tor in terminal
```
[warn] Socks version -125 not recognized. (Tor is not an http proxy.)
```
When this happens, ZeroNet begins to hang and stops updating sites. If I look at the stats page I usually see a bunch of nodes where connection status under `open` is `n/a`. Some nodes have a larger ping than normal, but eventually most nodes end up with a `n/a` state after a while.

#### Steps to reproduce:
Sometimes this happens the moment I start ZeroNet, while other times it happens after a while.
It seems to happen randomly, and I've experienced this problem in earlier versions.
When I try to restart ZeroNet after this happens to fix it, the same problem usually happens again.

Start by reproducing the issue in ZeroNet 0.6.0 rev3161 on Mac OS Sierra with Tor Browser and Tor set to always, while watching the terminal warning and stats page. Investigate the conditions associated with repeated “Socks version -125” messages, hanging updates, and nodes becoming n/a. Done means ZeroNet continues updating sites without those symptoms.

索引モデルが issue の本文から書いたものです。