text: Title: Fatal error starting Autokey. 'utf-8' codec can't decode byte 0xd2 in position 0: invalid continuation byte
  Body: Classification: Bug
  
  Reproducibility: Always
  
  ## Summary
  
  Since this morning, starting autokey-py shows an error dialog and exits:
  
  ```
  Fatal error starting AutoKey.
  'utf-8' codec can't decode byte 0xd2 in position 0: invalid continuation byte
  ```
  
  ## Steps to Reproduce
  
  1. Start autokey-py3.
  
  ## Expected Results
  
  Autokey should start. :-)
  
  ## Actual Results
  
  Apart from the error dialog, this is the output with `--verbose`:
  
  ```
  $ autokey-gtk --verbose
  Gtk-Message: GtkDialog mapped without a transient parent. This is discouraged.
  2017-01-12 00:40:30,776 ERROR - root - Fatal error starting AutoKey: 'utf-8' codec can't decode byte 0xd2 in position 0: invalid continuation byte
  Traceback (most recent call last):
    File "/usr/lib/python3/dist-packages/autokey/gtkapp.py", line 77, in __init__
      if self.__verifyNotRunning():
    File "/usr/lib/python3/dist-packages/autokey/gtkapp.py", line 95, in __verifyNotRunning
      with open(LOCK_FILE, 'r') as f: pid = f.read()
    File "/usr/lib/python3.5/codecs.py", line 321, in decode
      (result, consumed) = self._buffer_decode(data, self.errors, final)
  UnicodeDecodeError: 'utf-8' codec can't decode byte 0xd2 in position 0: invalid continuation byte
  ```
  
  ## Version
  
  AutoKey-Py3 version 0.93.9-1 from the Ubuntu PPA. The master branch ( commit c0f5af1217589d970ef028c243f8bdd5fc9c111d) has the same problem.
  
  Installed via: 0.93.9-1 from PPA, master branch using `python3 setup.py install`.
  
  Distro: Ubuntu 16.04.
  