Initial Python 3 compatible code

src/controller/buffers/__init__.py

@@ -4,4 +4,5 @@
   Currently, the package contains the following modules:
     * baseBuffers: Define a set of functions and structure to be expected in all buffers. New buffers should inherit its classes from one of the classes present here.
     * twitterBuffers: All other code, specific to Twitter.
-"""
+"""
+from __future__ import unicode_literals

src/controller/buffers/baseBuffers.py

@@ -1,5 +1,7 @@
 # -*- coding: utf-8 -*-
 """ Common logic to all buffers in TWBlue."""
+from __future__ import unicode_literals
+from builtins import object
 import logging
 import wx
 import output

src/controller/buffers/twitterBuffers.py

@@ -1,4 +1,7 @@
 # -*- coding: utf-8 -*-
+from __future__ import unicode_literals
+from builtins import str
+from builtins import range
 import time
 import platform
 if platform.system() == "Windows":
@@ -67,7 +70,7 @@ class baseBufferController(baseBuffers.buffer):
   """ Get buffer name from a set of different techniques."""
   # firstly let's take the easier buffers.
   basic_buffers = dict(home_timeline=_(u"Home"), mentions=_(u"Mentions"), direct_messages=_(u"Direct messages"), sent_direct_messages=_(u"Sent direct messages"), sent_tweets=_(u"Sent tweets"), favourites=_(u"Likes"), followers=_(u"Followers"), friends=_(u"Friends"), blocked=_(u"Blocked users"), muted=_(u"Muted users"))
-  if self.name in basic_buffers.keys():
+  if self.name in list(basic_buffers.keys()):
    return basic_buffers[self.name]
   # Check user timelines
   elif hasattr(self, "username"):
@@ -266,7 +269,7 @@ class baseBufferController(baseBuffers.buffer):
 
  def remove_tweet(self, id):
   if type(self.session.db[self.name]) == dict: return
-  for i in xrange(0, len(self.session.db[self.name])):
+  for i in range(0, len(self.session.db[self.name])):
    if self.session.db[self.name][i]["id"] == id:
     self.session.db[self.name].pop(i)
     self.remove_item(i)