fix typos and other cosmetic issues (#214)

cosmetic issues:
- reST headlines' underline length needs to match the headline length
  (looks like somebody is / was using a proportional font)
- Cython code lines do not need to be terminated with a semicolon
- always use triple-double-quotes for docstrings

test/test_pack.py

@@ -130,7 +130,7 @@ def testMapSize(sizes=[0, 5, 50, 1000]):
 
 
 class odict(dict):
-    '''Reimplement OrderedDict to run test on Python 2.6'''
+    """Reimplement OrderedDict to run test on Python 2.6"""
     def __init__(self, seq):
         self._seq = seq
         dict.__init__(self, seq)