bump version, mention "mp" also in the docs and changelog

CHANGELOG

@@ -10,6 +10,8 @@ Changes between 2.2.1 and 2.2.2.dev
 - fix issue106: allow parametrize to be applied multiple times
   e.g. from module, class and at function level.
 - add chdir method to monkeypatch funcarg
+- add "mp" funcargs as a shortcut for "monkeypatch"
+- fix crash resulting from calling monkeypatch undo a second time
 
 Changes between 2.2.0 and 2.2.1
 ----------------------------------------

_pytest/__init__.py

@@ -1,2 +1,2 @@
 #
-__version__ = '2.2.2.dev5'
+__version__ = '2.2.2.dev6'

doc/monkeypatch.txt

@@ -14,14 +14,14 @@ and a discussion of its motivation.
 
 .. _`monkeypatch blog post`: http://tetamap.wordpress.com/2009/03/03/monkeypatching-in-unit-tests-done-right/
 
-
-Simple example: patching ``os.path.expanduser``
+Simple example: monkeypatching functions
 ---------------------------------------------------
 
-If, for instance, you want to pretend that ``os.expanduser`` returns a certain
+If you want to pretend that ``os.expanduser`` returns a certain
 directory, you can use the :py:meth:`monkeypatch.setattr` method to
 patch this function before calling into a function which uses it::
 
+    # content of test_module.py
     import os.path
     def getssh(): # pseudo application code
         return os.path.join(os.path.expanduser("~admin"), '.ssh')
@@ -33,22 +33,20 @@ patch this function before calling into a function which uses it::
         x = getssh()
         assert x == '/abc/.ssh'
 
-After the test function finishes the ``os.path.expanduser`` modification
-will be undone.
+Here our test function monkeypatches ``os.path.expanduser`` and
+then calls into an function that calls it.  After the test function 
+finishes the ``os.path.expanduser`` modification will be undone.
 
-.. background check:
-   $ py.test
-   =========================== test session starts ============================
-   platform darwin -- Python 2.7.1 -- pytest-2.2.1
-   collecting ... collected 0 items
+.. note::
 
-   =============================  in 0.00 seconds =============================
+    As with version 2.2.2 there is a ``mp`` function argument
+    which is a shortcut for "monkeypatch". 
 
 Method reference of the monkeypatch function argument
 -----------------------------------------------------
 
 .. autoclass:: monkeypatch
-    :members: setattr, delattr, setitem, delitem, setenv, delenv, syspath_prepend, undo
+    :members: setattr, delattr, setitem, delitem, setenv, delenv, syspath_prepend, chdir, undo
 
 ``monkeypatch.setattr/delattr/delitem/delenv()`` all
 by default raise an Exception if the target does not exist.

setup.py

@@ -24,7 +24,7 @@ def main():
         name='pytest',
         description='py.test: simple powerful testing with Python',
         long_description = long_description,
-        version='2.2.2.dev5',
+        version='2.2.2.dev6',
         url='http://pytest.org',
         license='MIT license',
         platforms=['unix', 'linux', 'osx', 'cygwin', 'win32'],