document python 2.6 minimum requirement, remove all stuff that refers to 2.5

docs/extensiondev.rst

@@ -390,7 +390,7 @@ extension to be approved you have to follow these guidelines:
     (``PackageName==dev``).
 9.  The ``zip_safe`` flag in the setup script must be set to ``False``,
     even if the extension would be safe for zipping.
-10. An extension currently has to support Python 2.5, 2.6 as well as
+10. An extension currently has to support Python 2.6 as well as
     Python 2.7
 
 

docs/installation.rst

@@ -13,7 +13,7 @@ So how do you get all that on your computer quickly?  There are many ways you
 could do that, but the most kick-ass method is virtualenv, so let's have a look
 at that first.
 
-You will need Python 2.5 or higher to get started, so be sure to have an
+You will need Python 2.6 or higher to get started, so be sure to have an
 up-to-date Python 2.x installation.  Python 3.x is not supported.
 
 .. _virtualenv:

docs/patterns/jquery.rst

@@ -11,11 +11,7 @@ Python primitives (numbers, strings, dicts and lists) look like which is
 widely supported and very easy to parse.  It became popular a few years
 ago and quickly replaced XML as transport format in web applications.
 
-If you have Python 2.6 JSON will work out of the box, in Python 2.5 you
-will have to install the `simplejson`_ library from PyPI.
-
 .. _jQuery: http://jquery.com/
-.. _simplejson: http://pypi.python.org/pypi/simplejson
 
 Loading jQuery
 --------------

docs/tutorial/dbinit.rst

@@ -21,12 +21,9 @@ errors.  It's a good idea to add a function that initializes the database
 for you to the application.
 
 If you want to do that, you first have to import the
-:func:`contextlib.closing` function from the contextlib package.  If you
-want to use Python 2.5 it's also necessary to enable the `with` statement
-first (`__future__` imports must be the very first import). Accordingly,
-add the following lines to your existing imports in `flaskr.py`::
+:func:`contextlib.closing` function from the contextlib package.
+Accordingly, add the following lines to your existing imports in `flaskr.py`::
 
-    from __future__ import with_statement
     from contextlib import closing
 
 Next we can create a function called `init_db` that initializes the