added __repr__ that prints text in ipython for doc, token, and span objects

spacy/tokens/doc.pyx

@@ -120,6 +120,9 @@ cdef class Doc:
     def __str__(self):
         return u''.join([t.string for t in self])
 
+    def __repr__(self):
+        return u''.join([t.string for t in self])
+
     def similarity(self, other):
         if self.vector_norm == 0 or other.vector_norm == 0:
             return 0.0

spacy/tokens/spans.pyx

@@ -46,6 +46,12 @@ cdef class Span:
             return 0
         return self.end - self.start
 
+    def __repr__(self):
+        text = self.text_with_ws
+        if self[-1].whitespace_:
+            text = text[:-1]
+        return text
+
     def __getitem__(self, object i):
         if isinstance(i, slice):
             start, end = normalize_slice(len(self), i.start, i.stop, i.step)

spacy/tokens/token.pyx

@@ -43,6 +43,9 @@ cdef class Token:
     def __str__(self):
         return self.string
 
+    def __repr__(self):
+        return self.string
+
     cpdef bint check_flag(self, attr_id_t flag_id) except -1:
         return Lexeme.c_check_flag(self.c.lex, flag_id)