ZeroNet fails on PyPy

TL;DR: It's almost there, I believe (PyPy 4.0.1 on Linux):

``` sh
$ # Get a fresh copy of ZeroNet
$ git clone https://github.com/HelloZeroNet/ZeroNet
$ cd ZeroNet
$ # Install the msgpack-python and gevent modules
$ # (We already had a working copy of pip and virtualenv)
$ /opt/pypy/bin/pip install -r requirements.txt
$ # Create a virtual environment
$ /opt/pypy/bin/virtualenv venv
$ source venv/bin/activate
(venv) $ python zeronet.py
- Starting ZeroNet...
[18:36:04] - OpenSSL loaded, version: 01000207F
[18:36:05] - Version: 0.3.6 r989, Python 2.7.10 (5f8302b8bf9f, Mar 04 2016, 08:29:09)
[PyPy 4.0.1 with GCC 5.3.0], Gevent: 1.1.0
[18:36:05] - Creating FileServer....
[18:36:05] TorManager Tor controller connect error: error: [Errno 111] Connection refused in TorManager.py line 151 > _socket2.py line 228
[18:36:05] - Creating UiServer....
[18:36:05] Site:1Name2..hM9F Content.json not exist: data/1Name2NXVi1RDPDgf5617UoW7xA6YrhM9F/content.json
[18:36:05] - Removing old SSL certs...
[18:36:05] - Starting servers....
[18:36:05] Ui.UiServer --------------------------------------
[18:36:05] Ui.UiServer Web interface: http://127.0.0.1:43110/
[18:36:05] Ui.UiServer --------------------------------------
[18:36:05] Site:1Name2..hM9F Content.json not exist: data/1Name2NXVi1RDPDgf5617UoW7xA6YrhM9F/content.json
[18:36:06] FileServer Checking port 15441 using portchecker.co...
[18:36:07] FileServer [OK :)] Port open: Port 15441 is open.
[18:36:10] Ui.UiServer Wrapper key not found: 2948bfa27342bcc0fdabed5de2b53b9eafbce2a2ae5e7db650ab4d8c5bde9c28
[18:36:22] Db:TestDb Table keyvalue outdated...version: False need: 1, rebuilding...
[18:36:22] Db:TestDb Table json outdated...version: 0 need: 1, rebuilding...
[18:36:22] Db:TestDb Table test outdated...version: 0 need: 1426195822, rebuilding...
[18:36:27] - UiWSGIHandler error: OperationalError: database is locked in UiServer.py line 39 > pywsgi.py line 871 > pywsgi.py line 860 > StatsPlugin.py line 547 > Db.py line 119 > Db.py line 89 > Db.py line 60 > DbCursor.py line 53 > _sqlite3.py line 700 > _sqlite3.py line 857 > _sqlite3.py line 795 > _sqlite3.py line 181 > _sqlite3.py line 1026
```

In addition to the locked database as seen above, I also got an `msgpack` exception that I didn't catch when I ran the [benchmark](http://127.0.0.1:43110/Benchmark).

Will try again when PyPy 5.0 reaches ArchLinux.