Add byte prefix to some strings, for python 3 support

Should fix some of the issues in linsomniac#84

memcache.py

@@ -333,9 +333,9 @@ def get_stats(self, stat_args=None):
             readline = s.readline
             while 1:
                 line = readline()
-                if not line or line.strip() == 'END':
+                if not line or line.strip() == b'END':
                     break
-                stats = line.split(' ', 2)
+                stats = line.split(b' ', 2)
                 serverData[stats[1]] = stats[2]
 
         return(data)
@@ -357,11 +357,11 @@ def get_slabs(self):
             readline = s.readline
             while 1:
                 line = readline()
-                if not line or line.strip() == 'END':
+                if not line or line.strip() == b'END':
                     break
-                item = line.split(' ', 2)
+                item = line.split(b' ', 2)
                 # 0 = STAT, 1 = ITEM, 2 = Value
-                slab = item[1].split(':', 2)
+                slab = item[1].split(b':', 2)
                 # 0 = items, 1 = Slab #, 2 = Name
                 if slab[1] not in serverData:
                     serverData[slab[1]] = {}