Use pip --user instead of --install-option

doc/install.txt

-
 .. _install:
 
 
@@ -134,16 +133,15 @@ to your machine, you can install to an alternate prefix using
 
 .. code-block:: bash
 
-    pip install Theano --install-option='--prefix=~/.local'
+    pip install Theano --user
 
-e.g. using ``--install-option='--prefix=~/.local'`` on Python 2.4 would
+which on e.g. Python 2.4 would
 install Theano into ``.local/lib/python2.4/site-packages`` inside your home
 directory on Mac OS X or Unix/Linux (this ``site-packages`` directory must be
 listed in your ``PYTHONPATH`` environment variable; for Python 2.6 and later,
 ``~/.local`` is
 automatically searched and does *not* need to be explicitly included in
 ``PYTHONPATH``, see :ref:`config_pythonpath` for instructions).
-You can change ``~/.local``, but you need to change your ``PYTHONPATH`` as said above.
 
 Alternatively you can use virtualenv_ to create an isolated ``site-packages``
 directory; see the `virtualenv documentation`_ for details.
@@ -225,7 +223,7 @@ or (if you want to install it for the current user only):
 
 .. code-block:: bash
 
-    pip install --upgrade --no-deps git+git://github.com/Theano/Theano.git --install-option='--prefix=~/.local'
+    pip install --upgrade --no-deps git+git://github.com/Theano/Theano.git --user
 
 The following are general instructions that will set you up with the
 bleeding-edge version of Theano and allow you to hack it. First,