Variety crashed if user's home directory path contains Unicode characters(variety crashed with UnicodeDecodeError in expanduser(): 'ascii' codec can't decode byte 0xe6 in position 6: ordinal not in range(128))

[林博仁(Buo-ren, Lin)]

As title

```
Lin-Buo-Ren@Lin-Buo-Ren-SSD:~$ variety
/usr/lib/python2.7/dist-packages/variety/__init__.py:105: PyGIWarning: Gtk was imported without specifying a version first. Use gi.require_version('Gtk', '3.0') before import to ensure that the right version gets loaded.
  from gi.repository import Gtk, Gdk, GObject # pylint: disable=E0611
/usr/lib/python2.7/dist-packages/variety/VarietyWindow.py:25: PyGIWarning: Notify was imported without specifying a version first. Use gi.require_version('Notify', '0.7') before import to ensure that the right version gets loaded.
  from gi.repository import Gtk, Gdk, GdkPixbuf, GObject, Gio, Notify # pylint: disable=E0611
/usr/lib/python2.7/dist-packages/variety/AddPanoramioDialog.py:19: PyGIWarning: WebKit was imported without specifying a version first. Use gi.require_version('WebKit', '3.0') before import to ensure that the right version gets loaded.
  from gi.repository import Gtk, WebKit, GObject # pylint: disable=E0611
/usr/lib/python2.7/dist-packages/variety/QuoteWriter.py:19: PyGIWarning: PangoCairo was imported without specifying a version first. Use gi.require_version('PangoCairo', '1.0') before import to ensure that the right version gets loaded.
  from gi.repository import Gdk, Pango, PangoCairo, GdkPixbuf, GObject
/usr/lib/python2.7/dist-packages/variety/indicator.py:28: PyGIWarning: AppIndicator3 was imported without specifying a version first. Use gi.require_version('AppIndicator3', '0.1') before import to ensure that the right version gets loaded.
  from gi.repository import AppIndicator3 # pylint: disable=E0611
Traceback (most recent call last):
  File "/usr/bin/variety", line 39, in <module>
    variety.main()
  File "/usr/lib/python2.7/dist-packages/variety/__init__.py", line 178, in main
    Util.makedirs(os.path.expanduser(u"~/.config/variety/"))
  File "/usr/lib/python2.7/posixpath.py", line 273, in expanduser
    return (userhome + path[i:]) or '/'
UnicodeDecodeError: 'ascii' codec can't decode byte 0xe6 in position 6: ordinal not in range(128)
Lin-Buo-Ren@Lin-Buo-Ren-SSD:~$ pwd
/home/林博仁
```

ProblemType: Crash
DistroRelease: Ubuntu 16.04
Package: variety 0.6.0-1
ProcVersionSignature: Ubuntu 4.4.0-45.66-generic 4.4.21
Uname: Linux 4.4.0-45-generic x86_64
NonfreeKernelModules: nvidia_uvm nvidia_drm nvidia_modeset nvidia
ApportVersion: 2.20.1-0ubuntu2.1
Architecture: amd64
CurrentDesktop: Unity
Date: Thu Nov 17 17:47:16 2016
ExecutablePath: /usr/bin/variety
InterpreterPath: /usr/bin/python2.7
PackageArchitecture: all
ProcCmdline: /usr/bin/python /usr/bin/variety
PythonArgs: ['/usr/bin/variety']
SourcePackage: variety
Title: variety crashed with UnicodeDecodeError in expanduser(): 'ascii' codec can't decode byte 0xe6 in position 6: ordinal not in range(128)
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo vboxusers video

[James Lu (jlu5)]

Looking at https://bugs.python.org/issue18171, it may be better to replace:

    os.path.expanduser(u"~/.config/variety/")

with

    os.path.expanduser("~/.config/variety/")

However, I haven't tested this myself, so I can't confirm whether it works.