Replaced os.environ['HOME'] with os.path.expanduser('~') (Windows compatibility)

Solves #74

platypush/config/__init__.py

@@ -28,7 +28,7 @@ class Config(object):
         - /etc/platypush/config.yaml
     """
     _cfgfile_locations = [
-        os.path.join(os.environ['HOME'], '.config', 'platypush', 'config.yaml'),
+        os.path.join(os.path.expanduser('~'), '.config', 'platypush', 'config.yaml'),
         os.path.join(os.sep, 'etc', 'platypush', 'config.yaml'),
     ]
 
@@ -37,7 +37,7 @@ class Config(object):
         'now': datetime.datetime.now,
     }
 
-    _workdir_location = os.path.join(os.environ['HOME'], '.local', 'share', 'platypush')
+    _workdir_location = os.path.join(os.path.expanduser('~'), '.local', 'share', 'platypush')
     _included_files = set()
 
     def __init__(self, cfgfile=None):
@@ -69,7 +69,7 @@ class Config(object):
 
         self._config['db'] = self._config.get('main.db', {
             'engine': 'sqlite:///' + os.path.join(
-                os.environ['HOME'], '.local', 'share', 'platypush', 'main.db')
+                os.path.expanduser('~'), '.local', 'share', 'platypush', 'main.db')
         })
 
         logging_config = {

platypush/platydock/__init__.py

@@ -23,7 +23,7 @@ from platypush.config import Config
 from platypush.context import register_backends, get_plugin, get_backend
 
 
-workdir = os.path.join(os.environ['HOME'], '.local', 'share',
+workdir = os.path.join(os.path.expanduser('~'), '.local', 'share',
         'platypush', 'platydock')
 
 class Action(enum.Enum):

platypush/plugins/media/__init__.py

@@ -130,7 +130,7 @@ class MediaPlugin(Plugin):
 
         self.download_dir = os.path.abspath(os.path.expanduser(
             download_dir or player_config.get('download_dir') or
-            os.path.join((os.environ['HOME'] or self._env.get('HOME') or '/'), 'Downloads')))
+            os.path.join((os.path.expanduser('~') or self._env.get('HOME') or '/'), 'Downloads')))
 
         if not os.path.isdir(self.download_dir):
             os.makedirs(self.download_dir, exist_ok=True)

platypush/plugins/media/webtorrent.py

@@ -276,7 +276,7 @@ class MediaWebtorrentPlugin(MediaPlugin):
         if self._media_plugin.download_dir:
             return self._media_plugin.download_dir
         else:
-            d = os.path.join(os.environ['HOME'], 'Downloads')
+            d = os.path.join(os.path.expanduser('~'), 'Downloads')
             os.makedirs(d, exist_ok=True)
             return d