fix a few bugs and remove unused imports

wakatime/projects/base.py

@@ -10,7 +10,6 @@
 """
 
 import logging
-import os
 
 
 log = logging.getLogger('WakaTime')

wakatime/projects/wakatime.py

@@ -34,7 +34,7 @@ class WakaTime(BaseProject):
                 with open(self.config, 'r', encoding='utf-8') as fh:
                     self._project_name = u(fh.readline().strip())
                     self._project_branch = u(fh.readline().strip())
-            except IOError as e:
+            except IOError:
                 log.exception("Exception:")
 
             return True