Change python plugin interface.

Plugins/Wox.Plugin.Kill/main.py

@@ -27,7 +27,7 @@ def query(key):
             pass
     return json.dumps(results)
 
-def killProcess(pid):
+def killProcess(context,pid):
      p = psutil.Process(int(pid))
      if p:
          p.kill()

Plugins/Wox.Plugin.V2ex/main.py

@@ -27,7 +27,7 @@ def query(key):
         results.append(res)
     return json.dumps(results)
 
-def openUrl(url):
+def openUrl(context,url):
     webbrowser.open(url)
 
 if __name__ == "__main__":