Fix for python3

bmc.py

@@ -1,5 +1,6 @@
 #!/usr/bin/env python2
 # -*- coding: utf8 -*-
+from __future__ import unicode_literals
 
 import argparse
 import os

libbmc/backend.py

@@ -179,7 +179,7 @@ def deleteFile(filename):
         return False
 
     found = False
-    for key in bibtex.keys():
+    for key in list(bibtex.keys()):
         try:
             if os.path.samefile(bibtex[key]['file'], filename):
                 found = True
@@ -288,7 +288,7 @@ def getEntries():
         tools.warning("Unable to open index file.")
         return False
 
-    return bibtex.keys()
+    return list(bibtex.keys())
 
 
 def updateArXiv(entry):