Fix package "shasum" validation on Mac OS X 10.11.2 // Resolve #429

docs/installation.rst

@@ -58,6 +58,10 @@ The latest stable version of PlatformIO may be installed or upgraded via
 
     pip install -U platformio
 
+If ``pip`` command is not available run ``easy_install pip`` or use
+:ref:`installation_installer_script` which will install ``pip`` and
+``platformio`` automatically.
+
 Note that you may run into permissions issues running these commands. You have
 a few options here:
 
@@ -67,9 +71,6 @@ a few options here:
 * Run the command in a `virtualenv <https://virtualenv.pypa.io>`_ local to a
   specific project working set.
 
-If ``pip`` command is not available or you have problems with it try
-:ref:`installation_installer_script`.
-
 .. _installation_installer_script:
 
 b) Installer Script