Add notes about limitations with older pip version installs

* Workaround for pip versions less than 1.1
* Closes #57

README.rst

@@ -101,6 +101,13 @@ You could also install bitmath from `PyPi
 
    $ sudo pip install bitmath
 
+.. note::
+
+   **pip** installs need pip >= 1.1. To workaround this, `download
+   bitmath <https://pypi.python.org/pypi/bitmath/#downloads>`_, from
+   PyPi and then ``pip install bitmath-x.y.z.tar.gz``. See `issue #57
+   <https://github.com/tbielawa/bitmath/issues/57#issuecomment-227018168>`_
+   for more information.
 
 **Source**:
 

docsite/source/index.rst

@@ -96,6 +96,14 @@ You could also install bitmath from `PyPi
 
    $ sudo pip install bitmath
 
+.. note::
+
+   **pip** installs need pip >= 1.1. To workaround this, `download
+   bitmath <https://pypi.python.org/pypi/bitmath/#downloads>`_, from
+   PyPi and then ``pip install bitmath-x.y.z.tar.gz``. See `issue #57
+   <https://github.com/tbielawa/bitmath/issues/57#issuecomment-227018168>`_
+   for more information.
+
 
 **Source**:
 
@@ -135,7 +143,6 @@ Contents
 
 .. _index_examples:
 
-
 Examples
 ========
 

docsite/source/index.rst.in

@@ -96,6 +96,14 @@ You could also install bitmath from `PyPi
 
    $ sudo pip install bitmath
 
+.. note::
+
+   **pip** installs need pip >= 1.1. To workaround this, `download
+   bitmath <https://pypi.python.org/pypi/bitmath/#downloads>`_, from
+   PyPi and then ``pip install bitmath-x.y.z.tar.gz``. See `issue #57
+   <https://github.com/tbielawa/bitmath/issues/57#issuecomment-227018168>`_
+   for more information.
+
 
 **Source**:
 
@@ -135,4 +143,3 @@ Contents
 
 .. _index_examples:
 
-