[IMP] unittest2 > unittest

The `unittest2` package is simply a backport of `unittest` from the
Standard Library of Python 2.7 to previous versions.

There is no reason to use it any longer.

Closes #6941

doc/reference/javascript.rst

@@ -1330,11 +1330,6 @@ command-line (or in a CI system), but while actually running it is
 pretty simple the setup of the pre-requisite parts has some
 complexities.
 
-#. Install unittest2_ in your Python environment. Both
-   can trivially be installed via `pip <http://pip-installer.org>`_ or
-   `easy_install
-   <http://packages.python.org/distribute/easy_install.html>`_.
-
 #. Install PhantomJS_. It is a headless
    browser which allows automating running and testing web
    pages. QUnitSuite_ uses it to actually run the qunit_ test suite.
@@ -1402,8 +1397,6 @@ the OpenERP Web test suite.
 
 .. _qunit assertions: http://api.qunitjs.com/category/assert/
 
-.. _unittest2: http://pypi.python.org/pypi/unittest2
-
 .. _QUnitSuite: http://pypi.python.org/pypi/QUnitSuite/
 
 .. _PhantomJS: http://phantomjs.org/