Add ordereddict requirement

OrderedDict isn't in python 2.6 which is on some
older distros (still), so import the package that
provides it when it can not be found.

Change-Id: I9637d346e85c651e8e242025b9e88b1af3d8fca0

gertty/sync.py

@@ -24,6 +24,7 @@ import Queue
 import datetime
 
 import dateutil.parser
+import ordereddict
 import requests
 
 HIGH_PRIORITY=0
@@ -32,7 +33,10 @@ LOW_PRIORITY=2
 
 class MultiQueue(object):
     def __init__(self, priorities):
-        self.queues = collections.OrderedDict()
+        try:
+            self.queues = collections.OrderedDict()
+        except AttributeError:
+            self.queues = ordereddict.OrderedDict()
         for key in priorities:
             self.queues[key] = collections.deque()
         self.condition = threading.Condition()

requirements.txt

@@ -3,3 +3,4 @@ sqlalchemy
 GitPython>=0.3.2.RC1
 python-dateutil
 requests
+ordereddict