* Add .rank property to Token and Lexeme, for frequency rank

spacy/lexeme.pyx

@@ -83,6 +83,10 @@ cdef class Lexeme:
             for i, value in enumerate(vector):
                 self.c.vector[i] = value
 
+    property rank:
+        def __get__(self):
+            return self.c.id
+
     property repvec:
         def __get__(self):
             return self.vector

spacy/tokens/token.pyx

@@ -67,6 +67,10 @@ cdef class Token:
         def __get__(self):
             return self.c.lex.id
 
+    property rank:
+        def __get__(self):
+            return self.c.lex.id
+
     property string:
         def __get__(self):
             cdef unicode orth = self.vocab.strings[self.c.lex.orth]